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(2/3)*(6*a+3*b)-((1/2)*(a-(2*b))) = 0
(2/3)*(6*a+3*b)+(-1/2)*(a-2*b) = 0
2/3*(6*a+3*b)-1/2*(a-2*b) = 0
2/3*(6*a+3*b)-1/2*(a-2*b) = 0
7/2*a+3*b = 0
7/2*a+3*b = 0
x belongs to the empty set
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