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a in (-oo:+oo)
6*a-(3*a)+2 = -34 // + 34
6*a-(3*a)+2+34 = 0
6*a-3*a+2+34 = 0
3*a+36 = 0 // - 36
3*a = -36 // : 3
a = -36/3
a = -12
a = -12
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