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x in (-oo:+oo)
-15 = (3/17)*x // - (3/17)*x
-((3/17)*x)-15 = 0
(-3/17)*x-15 = 0
-3/17*x-15 = 0 // + 15
-3/17*x = 15 // : -3/17
x = 15/(-3/17)
x = -85
x = -85
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