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x in (-oo:+oo)
18 = (6/5)*x // - (6/5)*x
18-((6/5)*x) = 0
(-6/5)*x+18 = 0
18-6/5*x = 0 // - 18
-6/5*x = -18 // : -6/5
x = -18/(-6/5)
x = 15
x = 15
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