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(4*x+4)/8 = (3*x-9)/3 // - (3*x-9)/3
(4*x+4)/8-((3*x-9)/3) = 0
(4*x+4)/8+(-1*(3*x-9))/3 = 0
(3*(4*x+4))/(3*8)+(-1*8*(3*x-9))/(3*8) = 0
3*(4*x+4)-1*8*(3*x-9) = 0
84-12*x = 0
(84-12*x)/(3*8) = 0
(84-12*x)/(3*8) = 0 // * 3*8
84-12*x = 0
84-12*x = 0 // - 84
-12*x = -84 // : -12
x = -84/(-12)
x = 7
x = 7
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