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(1/2)*(9*y-1)+(1/4)*(2*y+9) = 0
1/2*(9*y-1)+1/4*(2*y+9) = 0
1/2*(9*y-1)+1/4*(2*y+9) = 0
5*y+7/4 = 0
5*y+7/4 = 0
5*y+7/4 = 0 // - 7/4
5*y = -7/4 // : 5
y = -7/4/5
y = -7/20
y = -7/20
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