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x in (-oo:+oo)
(3/5)*x-(10*x) = 12 // - 12
(3/5)*x-(10*x)-12 = 0
(3/5)*x-10*x-12 = 0
-47/5*x-12 = 0 // + 12
-47/5*x = 12 // : -47/5
x = 12/(-47/5)
x = -60/47
x = -60/47
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