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a in (-oo:+oo)
-7/10 = a/3 // - a/3
-(a/3)-7/10 = 0
-1/3*a-7/10 = 0 // + 7/10
-1/3*a = 7/10 // : -1/3
a = 7/10/(-1/3)
a = -21/10
a = -21/10
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