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a in (-oo:+oo)
-127 = 3-7*a-(6*a) // - 3-7*a-(6*a)
6*a-(-7*a)-127-3 = 0
7*a+6*a-127-3 = 0
13*a-130 = 0 // + 130
13*a = 130 // : 13
a = 130/13
a = 10
a = 10
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