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a in (-oo:+oo)
6*a-5 = 7*a+4 // - 7*a+4
6*a-(7*a)-5-4 = 0
6*a-7*a-5-4 = 0
-a-9 = 0 // + 9
-a = 9 // * -1
a = -9
a = -9
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