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