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a in (-oo:+oo)
2*(7*a+2) = 18 // - 18
2*(7*a+2)-18 = 0
2*(7*a+2)-18 = 0
14*a-14 = 0
14*a-14 = 0
14*a-14 = 0 // + 14
14*a = 14 // : 14
a = 14/14
a = 1
a = 1
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