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x in (-oo:+oo)
18 = (3/7)*x // - (3/7)*x
18-((3/7)*x) = 0
(-3/7)*x+18 = 0
18-3/7*x = 0 // - 18
-3/7*x = -18 // : -3/7
x = -18/(-3/7)
x = 42
x = 42
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