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x in (-oo:+oo)
18/90 = x/40 // - x/40
18/90-(x/40) = 0
1/5-1/40*x = 0 // - 1/5
-1/40*x = -1/5 // : -1/40
x = -1/5/(-1/40)
x = 8
x = 8
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