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