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x in (-oo:+oo)
18 = (3/5)*x // - (3/5)*x
18-((3/5)*x) = 0
(-3/5)*x+18 = 0
18-3/5*x = 0 // - 18
-3/5*x = -18 // : -3/5
x = -18/(-3/5)
x = 30
x = 30
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