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x in (-oo:+oo)
x/18 = 15/7.5 // - 15/7.5
x/18-(15/7.5) = 0
x/18-2 = 0
1/18*x-2 = 0 // + 2
1/18*x = 2 // : 1/18
x = 2/1/18
x = 36
x = 36
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