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x in (-oo:+oo)
(2/5)*x-((3/2)*x) = (3/4)*x+3 // - (3/4)*x+3
(2/5)*x-((3/2)*x)-((3/4)*x)-3 = 0
(2/5)*x+(-3/2)*x+(-3/4)*x-3 = 0
-37/20*x-3 = 0 // + 3
-37/20*x = 3 // : -37/20
x = 3/(-37/20)
x = -60/37
x = -60/37
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