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(1/3)*(6*x-15) = (1/4)*(20*x-8) // - (1/4)*(20*x-8)
(1/3)*(6*x-15)-((1/4)*(20*x-8)) = 0
(1/3)*(6*x-15)+(-1/4)*(20*x-8) = 0
1/3*(6*x-15)-1/4*(20*x-8) = 0
1/3*(6*x-15)-1/4*(20*x-8) = 0
-3*x-3 = 0
-3*x-3 = 0
-3*x-3 = 0 // + 3
-3*x = 3 // : -3
x = 3/(-3)
x = -1
x = -1
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