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x in (-oo:+oo)
x/18 = 14/36 // - 14/36
x/18-(14/36) = 0
x/18-7/18 = 0
1/18*x-7/18 = 0 // + 7/18
1/18*x = 7/18 // : 1/18
x = 7/18/1/18
x = 7
x = 7
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