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q in (-oo:+oo)
q/5+1/8 = 13/40 // - 13/40
q/5+1/8-(13/40) = 0
q/5+1/8-13/40 = 0
1/5*q-1/5 = 0 // + 1/5
1/5*q = 1/5 // : 1/5
q = 1/5/1/5
q = 1
q = 1
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