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a in (-oo:+oo)
(a+18)/3 = 18 // - 18
(a+18)/3-18 = 0
(a+18)/3+(-18*3)/3 = 0
a-18*3+18 = 0
a-36 = 0
(a-36)/3 = 0
(a-36)/3 = 0 // * 3
a-36 = 0
a-36 = 0 // + 36
a = 36
a = 36
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