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3*(4-(5*x)) = (4/5)*(x-12) // - (4/5)*(x-12)
3*(4-(5*x))-((4/5)*(x-12)) = 0
3*(4-5*x)+(-4/5)*(x-12) = 0
3*(4-5*x)-4/5*(x-12) = 0
3*(4-5*x)-4/5*(x-12) = 0
108/5-79/5*x = 0
108/5-79/5*x = 0
108/5-79/5*x = 0 // - 108/5
-79/5*x = -108/5 // : -79/5
x = -108/5/(-79/5)
x = 108/79
x = 108/79
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