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a in (-oo:+oo)
4*a+1/2 = 55/14 // - 55/14
4*a+1/2-(55/14) = 0
4*a+1/2-55/14 = 0
4*a-24/7 = 0 // + 24/7
4*a = 24/7 // : 4
a = 24/7/4
a = 6/7
a = 6/7
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