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