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x in (-oo:+oo)
18*a-((6*b)/(-3)) = x // - x
18*a-((6*b)/(-3))-x = 0
18*a+2*b-x = 0
18*a+2*b-x = 0 // - 18*a+2*b
-x = -(18*a+2*b) // * -1
x = 18*a+2*b
x = 18*a+2*b
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