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a in (-oo:+oo)
2*a-5/7 = -131/7 // + -131/7
2*a-5/7-(-131/7) = 0
2*a-5/7+131/7 = 0
2*a+18 = 0 // - 18
2*a = -18 // : 2
a = -18/2
a = -9
a = -9
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