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x in (-oo:+oo)
18/4 = x/10 // - x/10
18/4-(x/10) = 0
9/2-1/10*x = 0 // - 9/2
-1/10*x = -9/2 // : -1/10
x = -9/2/(-1/10)
x = 45
x = 45
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