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a in (-oo:+oo)
6*a+7/10 = 67/10 // - 67/10
6*a+7/10-(67/10) = 0
6*a+7/10-67/10 = 0
6*a-6 = 0 // + 6
6*a = 6 // : 6
a = 6/6
a = 1
a = 1
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