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a in (-oo:+oo)
2*(6*a+10) = 56 // - 56
2*(6*a+10)-56 = 0
2*(6*a+10)-56 = 0
12*a-36 = 0
12*a-36 = 0
12*a-36 = 0 // + 36
12*a = 36 // : 12
a = 36/12
a = 3
a = 3
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