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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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