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a in (-oo:+oo)
2*(7*a+4) = 36 // - 36
2*(7*a+4)-36 = 0
2*(7*a+4)-36 = 0
14*a-28 = 0
14*a-28 = 0
14*a-28 = 0 // + 28
14*a = 28 // : 14
a = 28/14
a = 2
a = 2
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