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12 = (1/3)*(4*x-3) // - (1/3)*(4*x-3)
12-((1/3)*(4*x-3)) = 0
(-1/3)*(4*x-3)+12 = 0
12-1/3*(4*x-3) = 0
12-1/3*(4*x-3) = 0
13-4/3*x = 0
13-4/3*x = 0
13-4/3*x = 0 // - 13
-4/3*x = -13 // : -4/3
x = -13/(-4/3)
x = 39/4
x = 39/4
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