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a in (-oo:+oo)
6*a+1/7 = 253/7 // - 253/7
6*a+1/7-(253/7) = 0
6*a+1/7-253/7 = 0
6*a-36 = 0 // + 36
6*a = 36 // : 6
a = 36/6
a = 6
a = 6
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