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7(x-3)-5(3-x)=11x-5
<=>7(x-3)+5(x-3)-11x+5=0
<=>12(x-3)-11x+5=0
<=>12x-36-11x+5=0
<=>x-31=0
<=>x=31
a, => 7x-63-30+5x=11x-6
=> 12x-93=11x-6
=> 12x=11x-6+93 = 11x+87
=> 12x-11x=87
=> x=87
b, => 7x-21-15+5x=11x-5
=> 12x-36=11x-5
=> 12x=11x-5+36 = 11x+31
=> 12x-11x=31
=> x=31
Tk mk nha
\(7.\left(x-3\right)-5.\left(3-x\right)=11x-5\)
\(7x-21-15+5x=11x-5\)
\(12x-36=11x-5\)
\(12x-11x=-5+36\)
\(x=31\)
Vậy \(x=31\)
\(7.\left(x-3\right)-5.\left(3-x\right)=11x-5\)
\(7x-7.3-5.3+5x=11x-5\)
\(7x-21-15+5x=11x-5\)
\(7x-\left(21+15\right)+5x=11x-5\)
\(7x-36+5x=11x-5\)
\(7x+5x-36=11x-5\)
\(12x-11x=\left(-5\right)+36\)
\(x=31\)
\(7\left(x-3\right)-5\left(3-x\right)=11x-5\)
\(\Leftrightarrow7x-21-15+5x=11x-5\)
\(\Leftrightarrow7x+5x-11x=-5+15+21\)
\(\Leftrightarrow x=31\)
Vậy...
\(7\left(x-3\right)-5\left(3-x\right)=11x-5.\)
\(\left(7x-21\right)-\left(15-5x\right)=11x-5\)
\(7x-21-15+5x=11x-5\)
\(12x-36=11x-5\)
\(12x-11x=36-5\)
\(x=31\)
7 (x - 3) - 5 (3 - x) = 11x - 5
7x - 7.3 - 5.3 - 5x = 11x - 5
7x - 5x - 21 -15 = 11x - 5
2x - (21 + 15) = 11x - 5
2x - 36 = 11x - 5
2x - 11x = 36 - 5
-9x = 31
x = 31:(-9)
x = \(\frac{-31}{9}\)