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x in (-oo:+oo)
-((-5/6)*x) = 20 // - 20
-((-5/6)*x)-20 = 0
(5/6)*x-20 = 0
5/6*x-20 = 0 // + 20
5/6*x = 20 // : 5/6
x = 20/5/6
x = 24
x = 24
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