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a in (-oo:+oo)
a/5 = 7.1 // - 7.1
a/5-7.1 = 0
1/5*a-7.1 = 0 // + 7.1
1/5*a = 7.1 // : 1/5
a = 7.1/1/5
a = 35.5
a = 35.5
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