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y in (-oo:+oo)
(1/2)*(5*y-2)+(1/4)*(6*y+9) = 0
1/2*(5*y-2)+1/4*(6*y+9) = 0
1/2*(5*y-2)+1/4*(6*y+9) = 0
4*y+5/4 = 0
4*y+5/4 = 0
4*y+5/4 = 0 // - 5/4
4*y = -5/4 // : 4
y = -5/4/4
y = -5/16
y = -5/16
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