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a in (-oo:+oo)
3/4 = a/20 // - a/20
3/4-(a/20) = 0
3/4-1/20*a = 0 // - 3/4
-1/20*a = -3/4 // : -1/20
a = -3/4/(-1/20)
a = 15
a = 15
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