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x in (-oo:+oo)
(1/3)*(12*x-15) = (1/5)*(25*x-20) // - (1/5)*(25*x-20)
(1/3)*(12*x-15)-((1/5)*(25*x-20)) = 0
(1/3)*(12*x-15)+(-1/5)*(25*x-20) = 0
1/3*(12*x-15)-1/5*(25*x-20) = 0
1/3*(12*x-15)-1/5*(25*x-20) = 0
-x-1 = 0
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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