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x in (-oo:+oo)
(1/5)*x-15 = x-3 // - x-3
(1/5)*x-x-15+3 = 0
-4/5*x-12 = 0 // + 12
-4/5*x = 12 // : -4/5
x = 12/(-4/5)
x = -15
x = -15
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