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3*(x/8-4) = x/4-9 // - x/4-9
3*(x/8-4)-(x/4)+9 = 0
3*(1/8*x-4)-x/4+9 = 0
(3*4*(1/8*x-4))/4-x/4+(4*9)/4 = 0
3*4*(1/8*x-4)-x+4*9 = 0
1/2*x-48+36 = 0
1/2*x-12 = 0
(1/2*x-12)/4 = 0
(1/2*x-12)/4 = 0 // * 4
1/2*x-12 = 0
1/2*x-12 = 0 // + 12
1/2*x = 12 // : 1/2
x = 12/1/2
x = 24
x = 24
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