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a in (-oo:+oo)
3*a-(5*a)+9 = 29 // - 29
3*a-(5*a)-29+9 = 0
3*a-5*a-29+9 = 0
-2*a-20 = 0 // + 20
-2*a = 20 // : -2
a = 20/(-2)
a = -10
a = -10
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