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a in (-oo:+oo)
a+6 = -2*a-27 // + -2*a-27
a-(-2*a)+6+27 = 0
a+2*a+6+27 = 0
3*a+33 = 0 // - 33
3*a = -33 // : 3
a = -33/3
a = -11
a = -11
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