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