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y in (-oo:+oo)
1/2 = (-1/4)*y-(1/7) // - (-1/4)*y-(1/7)
1/2-((-1/4)*y)+1/7 = 0
(1/4)*y+1/2+1/7 = 0
1/4*y+9/14 = 0 // - 9/14
1/4*y = -9/14 // : 1/4
y = -9/14/1/4
y = -18/7
y = -18/7
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