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x in (-oo:+oo)
(3/5)*x+12 = (4/5)*x-7 // - (4/5)*x-7
(3/5)*x-((4/5)*x)+7+12 = 0
(3/5)*x+(-4/5)*x+7+12 = 0
19-1/5*x = 0 // - 19
-1/5*x = -19 // : -1/5
x = -19/(-1/5)
x = 95
x = 95
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