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a in (-oo:+oo)
a-6 = 7*a+60 // - 7*a+60
a-(7*a)-60-6 = 0
a-7*a-60-6 = 0
-6*a-66 = 0 // + 66
-6*a = 66 // : -6
a = 66/(-6)
a = -11
a = -11
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