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q in (-oo:+oo)
2*q-(3/5) = 7/10 // - 7/10
2*q-(3/5)-(7/10) = 0
2*q-3/5-7/10 = 0
2*q-13/10 = 0 // + 13/10
2*q = 13/10 // : 2
q = 13/10/2
q = 13/20
q = 13/20
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