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