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x in (-oo:+oo)
(1/3)*(18*X+15) = (1/4)*(4*x+40) // - (1/4)*(4*x+40)
(1/3)*(18*X+15)-((1/4)*(4*x+40)) = 0
(1/3)*(18*X+15)+(-1/4)*(4*x+40) = 0
1/3*(18*X+15)-1/4*(4*x+40) = 0
1/3*(18*X+15)-1/4*(4*x+40) = 0
6*X-x-5 = 0
6*X-x-5 = 0
6*X-x-5 = 0 // - 6*X-5
-x = -(6*X-5) // * -1
x = 6*X-5
x = 6*X-5
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