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(1/2)*(12*x-6)-(4*(3*x-8)) = -7 // + 7
(1/2)*(12*x-6)-(4*(3*x-8))+7 = 0
(1/2)*(12*x-6)-4*(3*x-8)+7 = 0
1/2*(12*x-6)-4*(3*x-8)+7 = 0
1/2*(12*x-6)-4*(3*x-8)+7 = 0
7-6*x+29 = 0
36-6*x = 0
36-6*x = 0
36-6*x = 0 // - 36
-6*x = -36 // : -6
x = -36/(-6)
x = 6
x = 6
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