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x in (-oo:+oo)
-((5/6)*x)-7 = 18 // - 18
-((5/6)*x)-18-7 = 0
(-5/6)*x-18-7 = 0
-5/6*x-25 = 0 // + 25
-5/6*x = 25 // : -5/6
x = 25/(-5/6)
x = -30
x = -30
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