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a in (-oo:+oo)
4/5 = a/35 // - a/35
4/5-(a/35) = 0
4/5-1/35*a = 0 // - 4/5
-1/35*a = -4/5 // : -1/35
a = -4/5/(-1/35)
a = 28
a = 28
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