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x in (-oo:+oo)
x/18 = -5/6 // + -5/6
x/18-(-5/6) = 0
x/18+5/6 = 0
1/18*x+5/6 = 0 // - 5/6
1/18*x = -5/6 // : 1/18
x = -5/6/1/18
x = -15
x = -15
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