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y in (-oo:+oo)
3/7-((1/4)*y) = 1/2 // - 1/2
3/7-((1/4)*y)-(1/2) = 0
(-1/4)*y+3/7-1/2 = 0
-1/4*y-1/14 = 0 // + 1/14
-1/4*y = 1/14 // : -1/4
y = 1/14/(-1/4)
y = -2/7
y = -2/7
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