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a in (-oo:+oo)
(-2/6)*(6-(2*a)) = 6 // - 6
(-2/6)*(6-(2*a))-6 = 0
(-2/6)*(6-2*a)-6 = 0
-1/3*(6-2*a)-6 = 0
-1/3*(6-2*a)-6 = 0
2/3*a-8 = 0
2/3*a-8 = 0
2/3*a-8 = 0 // + 8
2/3*a = 8 // : 2/3
a = 8/2/3
a = 12
a = 12
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