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x in (-oo:+oo)
(8*x)/5-12 = 3*x+30 // - 3*x+30
(8*x)/5-(3*x)-30-12 = 0
(8*x)/5-3*x-30-12 = 0
-7/5*x-42 = 0 // + 42
-7/5*x = 42 // : -7/5
x = 42/(-7/5)
x = -30
x = -30
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