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x in (-oo:+oo)
-7 = (-5/6)*x+(7/6)*x+3 // - (-5/6)*x+(7/6)*x+3
-((-5/6)*x)-((7/6)*x)-7-3 = 0
(5/6)*x+(-7/6)*x-7-3 = 0
-1/3*x-10 = 0 // + 10
-1/3*x = 10 // : -1/3
x = 10/(-1/3)
x = -30
x = -30
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