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x in (-oo:+oo)
27/18-(5/12)+4/9 = x // - x
27/18-x-(5/12)+4/9 = 0
27/18-x-5/12+4/9 = 0
55/36-x = 0 // - 55/36
-x = -55/36 // * -1
x = 55/36
x = 55/36
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