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x in (-oo:+oo)
-30 = (5/17)*x // - (5/17)*x
-((5/17)*x)-30 = 0
(-5/17)*x-30 = 0
-5/17*x-30 = 0 // + 30
-5/17*x = 30 // : -5/17
x = 30/(-5/17)
x = -102
x = -102
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