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