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x in (-oo:+oo)
20/8 = x/18 // - x/18
20/8-(x/18) = 0
5/2-1/18*x = 0 // - 5/2
-1/18*x = -5/2 // : -1/18
x = -5/2/(-1/18)
x = 45
x = 45
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