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(1/4)*(12*x-20) = (1/5)*(25*x-15) // - (1/5)*(25*x-15)
(1/4)*(12*x-20)-((1/5)*(25*x-15)) = 0
(1/4)*(12*x-20)+(-1/5)*(25*x-15) = 0
1/4*(12*x-20)-1/5*(25*x-15) = 0
1/4*(12*x-20)-1/5*(25*x-15) = 0
-2*x-2 = 0
-2*x-2 = 0
-2*x-2 = 0 // + 2
-2*x = 2 // : -2
x = 2/(-2)
x = -1
x = -1
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