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x in (-oo:+oo)
(1/3)*(12*x-15) = (1/4)*(20*x-16) // - (1/4)*(20*x-16)
(1/3)*(12*x-15)-((1/4)*(20*x-16)) = 0
(1/3)*(12*x-15)+(-1/4)*(20*x-16) = 0
1/3*(12*x-15)-1/4*(20*x-16) = 0
1/3*(12*x-15)-1/4*(20*x-16) = 0
-x-1 = 0
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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