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(1/9)*(7*x-8) = x+8/18 // - x+8/18
(1/9)*(7*x-8)-x-(8/18) = 0
(1/9)*(7*x-8)-x-4/9 = 0
1/9*(7*x-8)-x-4/9 = 0
(1/9*9*(7*x-8))/9+(9*(-x))/9-4/9 = 0
1/9*9*(7*x-8)+9*(-x)-4 = 0
-2*x-8-4 = 0
-2*x-12 = 0
(-2*x-12)/9 = 0
(-2*x-12)/9 = 0 // * 9
-2*x-12 = 0
-2*x-12 = 0 // + 12
-2*x = 12 // : -2
x = 12/(-2)
x = -6
x = -6
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