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a in (-oo:+oo)
-3*a-10 = 3*a-34 // - 3*a-34
34-3*a-(3*a)-10 = 0
34-3*a-3*a-10 = 0
24-6*a = 0 // - 24
-6*a = -24 // : -6
a = -24/(-6)
a = 4
a = 4
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