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(1/2)*(6*a+4)+(1/2)*(6*a-4) = 0
1/2*(6*a+4)+1/2*(6*a-4) = 0
1/2*(6*a+4)+1/2*(6*a-4) = 0
6*a = 0
6*a = 0
6*a = 0 // : 6
a = 0
a = 0
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