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a in (-oo:+oo)
2/3 = a/15 // - a/15
2/3-(a/15) = 0
2/3-1/15*a = 0 // - 2/3
-1/15*a = -2/3 // : -1/15
a = -2/3/(-1/15)
a = 10
a = 10
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