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x in (-oo:+oo)
(3*x-15)/2 = 4*x // - 4*x
(3*x-15)/2-(4*x) = 0
(3*x-15)/2-4*x = 0
(3*x-15)/2+(-4*2*x)/2 = 0
3*x-4*2*x-15 = 0
-5*x-15 = 0
(-5*x-15)/2 = 0
(-5*x-15)/2 = 0 // * 2
-5*x-15 = 0
-5*x-15 = 0 // + 15
-5*x = 15 // : -5
x = 15/(-5)
x = -3
x = -3
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