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a in (-oo:+oo)
2*(1*a+1) = 26 // - 26
2*(1*a+1)-26 = 0
2*(a+1)-26 = 0
2*(a+1)-26 = 0
2*a-24 = 0
2*a-24 = 0
2*a-24 = 0 // + 24
2*a = 24 // : 2
a = 24/2
a = 12
a = 12
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