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a in (-oo:+oo)
a/7+1/4 = 5/6 // - 5/6
a/7+1/4-(5/6) = 0
a/7+1/4-5/6 = 0
1/7*a-7/12 = 0 // + 7/12
1/7*a = 7/12 // : 1/7
a = 7/12/1/7
a = 49/12
a = 49/12
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