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a in (-oo:+oo)
16 = 2*a+3*a+1 // - 2*a+3*a+1
16-(2*a)-(3*a)-1 = 0
16-2*a-3*a-1 = 0
15-5*a = 0 // - 15
-5*a = -15 // : -5
a = -15/(-5)
a = 3
a = 3
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