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(3/4)*(x-12) = (1/4)*(x-12) // - (1/4)*(x-12)
(3/4)*(x-12)-((1/4)*(x-12)) = 0
(3/4)*(x-12)+(-1/4)*(x-12) = 0
3/4*(x-12)-1/4*(x-12) = 0
3/4*(x-12)-1/4*(x-12) = 0
1/2*x-6 = 0
1/2*x-6 = 0
1/2*x-6 = 0 // + 6
1/2*x = 6 // : 1/2
x = 6/1/2
x = 12
x = 12
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