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x in (-oo:+oo)
-2/5 = 18*x // - 18*x
-(18*x)-2/5 = 0
-18*x-2/5 = 0
-18*x-2/5 = 0 // + 2/5
-18*x = 2/5 // : -18
x = 2/5/(-18)
x = -1/45
x = -1/45
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