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a in (-oo:+oo)
27 = 2*a-6*a+3 // - 2*a-6*a+3
27-(-6*a)-(2*a)-3 = 0
6*a-2*a-3+27 = 0
4*a+24 = 0 // - 24
4*a = -24 // : 4
a = -24/4
a = -6
a = -6
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