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a, 315-x=327-264
<=> 315-x=63
<=> x=315-63
<=>x=252
b, 147-x=10 x 5
<=> 147-x=50
<=> x= 147-50
<=> x=97
\(\left(315-x\right)+264=327\)
\(\left(315-x\right)=63\)
\(x=315-63\)
\(x=252\)
\(\left(147-x\right):5=10\)
\(\left(147-x\right)=50\)
\(x=147-50\)
\(x=97\)
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5 x 7 x 77 -7 x 60 + 49 x25 - 15 x 42
=7x385-7x60+49x25-15x42
=7x(385-60)+49x25-15x42
=7x325+49x25-15x42
=2275+49x25-15x42
=2275+1225-630
=3500-630
=2870
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a) x : [ ( 1800 + 600) : 30 ] = 560 : ( 315 - 35 )
x : [ 2400 : 30 ] = 560 : 280
x : 80 = 2
x = 160
b) [ ( 250 - 25 ) : 15 ] : x = (450 - 60 ) : 130
[ 225 : 15 ] : x = 390 : 130
15 : x = 3
x = 15 : 3
x = 5
a) x : [ (1800 + 600) : 30 ] = 560 : (315 - 35)
x : 80 = 2
x = 80 : 2
x = 40
b) [ (250 - 25) : 15 ] : x = (450 - 60) : 130
15 : x = 3
x = 15 : 3
x = 5
x+x:55,5=315
x.1+x:55,5=315
x.(1+55,5)=315
x.56,5=315
x =315:55,5
x =\(\frac{210}{37}\)
\(x+x:55,5=315\)
\(x+x.\frac{2}{111}=315\)
\(x\left(1+\frac{2}{111}\right)=315\)
\(x.\frac{113}{111}=315\)
\(x=315:\frac{113}{111}\)
\(x=\frac{34965}{113}\)