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a in (-oo:+oo)
a+6*a = 153/4 // - 153/4
a+6*a-(153/4) = 0
a+6*a-153/4 = 0
7*a-153/4 = 0 // + 153/4
7*a = 153/4 // : 7
a = 153/4/7
a = 153/28
a = 153/28
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