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((5*(x-9))/2-4+12)/3+7 = x // - x
((5*(x-9))/2-4+12)/3-x+7 = 0
((5*(x-9))/2-4+12)/3+(3*(-x))/3+(3*7)/3 = 0
13-x = 0
(5*(x-9))/2+3*(-x)+3*7-4+12 = 0
(5*(x-9))/2+(2*3*(-x))/2+(-4*2)/2+(2*12)/2+(2*3*7)/2 = 0
5*(x-9)+2*3*(-x)-4*2+2*12+2*3*7 = 0
5*x-6*x-53+24+42 = 0
5*x-6*x-29+42 = 0
42-x-29 = 0
13-x = 0
(13-x)/2 = 0
(13-x)/(2*3) = 0
(13-x)/(2*3) = 0 // * 2*3
13-x = 0
13-x = 0 // - 13
-x = -13 // * -1
x = 13
x = 13
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