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a in (-oo:+oo)
2/5-(9/10) = a/3 // - a/3
2/5-(a/3)-(9/10) = 0
2/5-(a/3)-9/10 = 0
-1/3*a-1/2 = 0 // + 1/2
-1/3*a = 1/2 // : -1/3
a = 1/2/(-1/3)
a = -3/2
a = -3/2
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