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a in (-oo:+oo)
a/20+4/15 = 9.15 // - 9.15
a/20+4/15-9.15 = 0
1/20*a-8.88333333 = 0 // + 8.88333333
1/20*a = 8.88333333 // : 1/20
a = 8.88333333/1/20
a = 177.6666666
a = 177.6666666
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