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q in (-oo:+oo)
77/10-q = 13/10 // - 13/10
77/10-q-(13/10) = 0
77/10-q-13/10 = 0
32/5-q = 0 // - 32/5
-q = -32/5 // * -1
q = 32/5
q = 32/5
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