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x in (-oo:+oo)
(1/5)*(5*x-15) = (1/4)*(8*x+4) // - (1/4)*(8*x+4)
(1/5)*(5*x-15)-((1/4)*(8*x+4)) = 0
(1/5)*(5*x-15)+(-1/4)*(8*x+4) = 0
1/5*(5*x-15)-1/4*(8*x+4) = 0
1/5*(5*x-15)-1/4*(8*x+4) = 0
-x-4 = 0
-x-4 = 0
-x-4 = 0 // + 4
-x = 4 // * -1
x = -4
x = -4
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