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x in (-oo:+oo)
18/5 = 4*x // - 4*x
18/5-(4*x) = 0
18/5-4*x = 0
18/5-4*x = 0 // - 18/5
-4*x = -18/5 // : -4
x = -18/5/(-4)
x = 9/10
x = 9/10
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