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a in (-oo:+oo)
a/7-(7/8) = -25/56 // + -25/56
a/7-(7/8)-(-25/56) = 0
a/7-7/8+25/56 = 0
1/7*a-3/7 = 0 // + 3/7
1/7*a = 3/7 // : 1/7
a = 3/7/1/7
a = 3
a = 3
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