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a in (-oo:+oo)
a/5-a-(3/10) = 7/10 // - 7/10
a/5-a-(3/10)-(7/10) = 0
a/5-a-3/10-7/10 = 0
-4/5*a-1 = 0 // + 1
-4/5*a = 1 // : -4/5
a = 1/(-4/5)
a = -5/4
a = -5/4
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