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x in (-oo:+oo)
(-3/5)*x-3 = 15 // - 15
(-3/5)*x-15-3 = 0
-3/5*x-18 = 0 // + 18
-3/5*x = 18 // : -3/5
x = 18/(-3/5)
x = -30
x = -30
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