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a in (-oo:+oo)
3*a+2 = 6*a-13 // - 6*a-13
3*a-(6*a)+2+13 = 0
3*a-6*a+2+13 = 0
15-3*a = 0 // - 15
-3*a = -15 // : -3
a = -15/(-3)
a = 5
a = 5
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