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a in (-oo:+oo)
-a-7 = -38/5 // + -38/5
-a-(-38/5)-7 = 0
38/5-a-7 = 0
3/5-a = 0 // - 3/5
-a = -3/5 // * -1
a = 3/5
a = 3/5
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