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12 = (8-x)/5 // - (8-x)/5
12-((8-x)/5) = 0
(-1*(8-x))/5+12 = 0
(-1*(8-x))/5+(5*12)/5 = 0
5*12-1*(8-x) = 0
x+52 = 0
(x+52)/5 = 0
(x+52)/5 = 0 // * 5
x+52 = 0
x+52 = 0 // - 52
x = -52
x = -52
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