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y in (-oo:+oo)
(1/4)*(7*y-2)+(1/8)*(2*y+9) = 0
1/4*(7*y-2)+1/8*(2*y+9) = 0
1/4*(7*y-2)+1/8*(2*y+9) = 0
2*y+5/8 = 0
2*y+5/8 = 0
2*y+5/8 = 0 // - 5/8
2*y = -5/8 // : 2
y = -5/8/2
y = -5/16
y = -5/16
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