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a in (-oo:+oo)
-(7*a)-6 = -76 // + 76
76-(7*a)-6 = 0
76-7*a-6 = 0
70-7*a = 0 // - 70
-7*a = -70 // : -7
a = -70/(-7)
a = 10
a = 10
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