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x in (-oo:+oo)
x/18 = 2/10 // - 2/10
x/18-(2/10) = 0
x/18-1/5 = 0
1/18*x-1/5 = 0 // + 1/5
1/18*x = 1/5 // : 1/18
x = 1/5/1/18
x = 18/5
x = 18/5
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