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(3*x-3)/4 = (x-7)/2 // - (x-7)/2
(3*x-3)/4-((x-7)/2) = 0
(3*x-3)/4+(-1*(x-7))/2 = 0
(2*(3*x-3))/(2*4)+(-1*4*(x-7))/(2*4) = 0
2*(3*x-3)-1*4*(x-7) = 0
2*x+22 = 0
(2*x+22)/(2*4) = 0
(2*x+22)/(2*4) = 0 // * 2*4
2*x+22 = 0
2*x+22 = 0 // - 22
2*x = -22 // : 2
x = -22/2
x = -11
x = -11
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