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x in (-oo:+oo)
(3/4)*x-15 = (6/5)*x+12 // - (6/5)*x+12
(3/4)*x-((6/5)*x)-15-12 = 0
(3/4)*x+(-6/5)*x-15-12 = 0
-9/20*x-27 = 0 // + 27
-9/20*x = 27 // : -9/20
x = 27/(-9/20)
x = -60
x = -60
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