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a in (-oo:+oo)
4*(7*a+3) = 68 // - 68
4*(7*a+3)-68 = 0
4*(7*a+3)-68 = 0
28*a-56 = 0
28*a-56 = 0
28*a-56 = 0 // + 56
28*a = 56 // : 28
a = 56/28
a = 2
a = 2
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