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x in (-oo:+oo)
18 = (3/13)*x // - (3/13)*x
18-((3/13)*x) = 0
(-3/13)*x+18 = 0
18-3/13*x = 0 // - 18
-3/13*x = -18 // : -3/13
x = -18/(-3/13)
x = 78
x = 78
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