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a in (-oo:+oo)
7*(6*a-6) = -252 // + 252
7*(6*a-6)+252 = 0
7*(6*a-6)+252 = 0
42*a+210 = 0
42*a+210 = 0
42*a+210 = 0 // - 210
42*a = -210 // : 42
a = -210/42
a = -5
a = -5
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