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y in (-oo:+oo)
(1/2)*(7*y-1)+(1/4)*(2*y+8) = 0
1/2*(7*y-1)+1/4*(2*y+8) = 0
1/2*(7*y-1)+1/4*(2*y+8) = 0
4*y+3/2 = 0
4*y+3/2 = 0
4*y+3/2 = 0 // - 3/2
4*y = -3/2 // : 4
y = -3/2/4
y = -3/8
y = -3/8
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