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(1/2)*(4*x-(6*y)) = 0
(1/2)*(4*x-6*y) = 0
1/2*(4*x-6*y) = 0
4*x-6*y = 0 // + -6*y
4*x = -(-6*y) // : 4
x = (-(-6*y))/4
x = (3*y)/2
x = (3*y)/2
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