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a in (-oo:+oo)
6*(2*a-8) = -36 // + 36
6*(2*a-8)+36 = 0
6*(2*a-8)+36 = 0
12*a-12 = 0
12*a-12 = 0
12*a-12 = 0 // + 12
12*a = 12 // : 12
a = 12/12
a = 1
a = 1
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