149*(x-6)=131
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=> 131.( x - 37 ) = 0
=> x - 37 = 0 : 131
=> x - 37 = 0
=> x = 0 + 37
=> x = 37
131 . (x - 37) = ( 2 + 4 + 6 + ... + 100) . (36.333 - 108 .111)
=> 131 . (x - 37) = ( 2 + 4 + 6 + ... + 100) . (36.3.111 - 108 .111)
=> 131 . (x - 37) = ( 2 + 4 + 6 + ... + 100) . [111.(36.3 - 108)]
=> 131 . (x - 37) = ( 2 + 4 + 6 + ... + 100) . [111.0]
=> 131 . (x - 37) = 0
=> x - 37 = 0 . 131 = 0
=> x = 0 + 37 = 37
Vậy x = 37
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`2x -2/3 +1/2x =-1`
`=> 2x+1/2x =-1+2/3`
`=> (2+1/2) x =-3/3 + 2/3`
`= 5/2 x = -1/3`
`=> x=-1/3 : 5/2`
`=>x= -2/15`
`31/36 - (1/3-x)^2 =5/6`
`=> (1/3-x)^2 = 31/36 - 5/6`
`=> (1/3-x)^2 =1/36`
`=> (1/3-x)^2 = (+-1/6)^2`
\(\Rightarrow\left[{}\begin{matrix}\dfrac{1}{3}-x=\dfrac{1}{6}\\\dfrac{1}{3}-x=-\dfrac{1}{6}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{6}\\x=\dfrac{1}{2}\end{matrix}\right.\)
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d. 54-54+67-37+10
=40
e. 326+174-43-57
=400
f. 351+149-875-125
=-500
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`- 9 . ( x - 6 ) + 20 = 56`
`=> -9 . ( x - 6 ) = 56-20`
`=> -9 . ( x - 6 ) =36`
`=>x-6=36:(-9)`
`=>x-6=-4`
`=>x=-4+6`
`=>x=2`
`-------------`
` ( 245 - x ) + 7^2=149`
`=>( 245 - x ) +49=149`
`=> 245 - x =149-49`
`=> 245 - x =100`
`=>x=245-100`
`=>x=145`
`------------`
`(2^x-3).7=35`
`=> 2^x-3=35:7`
`=> 2^x-3=5`
`=>2^x=5+3`
`=>2^x=8`
`=>2^x=2^3`
`=>x=3`
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24 .x - 32.x = 149 - 36 : 34
16.x - 9.x = 149 - 32
x.( 16 - 9 ) = 149 - 9
x.5 = 140
x = 140 : 5
x = 28
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(=) 149x - 894 = 131
(=) 149x = 1025
(=) x = \(\dfrac{1025}{149}\)