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a in (-oo:+oo)
-(3*a)-4 = 10-a // - 10-a
a-(3*a)-10-4 = 0
a-3*a-10-4 = 0
-2*a-14 = 0 // + 14
-2*a = 14 // : -2
a = 14/(-2)
a = -7
a = -7
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