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x in (-oo:+oo)
-15 = (3/5)*x // - (3/5)*x
-((3/5)*x)-15 = 0
(-3/5)*x-15 = 0
-3/5*x-15 = 0 // + 15
-3/5*x = 15 // : -3/5
x = 15/(-3/5)
x = -25
x = -25
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