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a in (-oo:+oo)
1/28 = a+3/4 // - a+3/4
1/28-a-(3/4) = 0
1/28-a-3/4 = 0
-a-5/7 = 0 // + 5/7
-a = 5/7 // * -1
a = -5/7
a = -5/7
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