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a in (-oo:+oo)
2*(1*a+1) = 6 // - 6
2*(1*a+1)-6 = 0
2*(a+1)-6 = 0
2*(a+1)-6 = 0
2*a-4 = 0
2*a-4 = 0
2*a-4 = 0 // + 4
2*a = 4 // : 2
a = 4/2
a = 2
a = 2
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