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a in (-oo:+oo)
2*(7*a+3) = 76 // - 76
2*(7*a+3)-76 = 0
2*(7*a+3)-76 = 0
14*a-70 = 0
14*a-70 = 0
14*a-70 = 0 // + 70
14*a = 70 // : 14
a = 70/14
a = 5
a = 5
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