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a in (-oo:+oo)
a/30 = 80/100 // - 80/100
a/30-(80/100) = 0
a/30-4/5 = 0
1/30*a-4/5 = 0 // + 4/5
1/30*a = 4/5 // : 1/30
a = 4/5/1/30
a = 24
a = 24
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