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(1/2)*(3*y-1)+(1/4)*(6*y+9) = 0
1/2*(3*y-1)+1/4*(6*y+9) = 0
1/2*(3*y-1)+1/4*(6*y+9) = 0
3*y+7/4 = 0
3*y+7/4 = 0
3*y+7/4 = 0 // - 7/4
3*y = -7/4 // : 3
y = -7/4/3
y = -7/12
y = -7/12
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