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a in (-oo:+oo)
-6*a-(6*a)-5 = 127 // - 127
-6*a-(6*a)-127-5 = 0
-6*a-6*a-127-5 = 0
-12*a-132 = 0 // + 132
-12*a = 132 // : -12
a = 132/(-12)
a = -11
a = -11
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