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x in (-oo:+oo)
x/18 = 100/200 // - 100/200
x/18-(100/200) = 0
x/18-1/2 = 0
1/18*x-1/2 = 0 // + 1/2
1/18*x = 1/2 // : 1/18
x = 1/2/1/18
x = 9
x = 9
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