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y in (-oo:+oo)
1/2-((7/2)*y) = 5*y // - 5*y
1/2-((7/2)*y)-(5*y) = 0
(-7/2)*y-5*y+1/2 = 0
1/2-17/2*y = 0 // - 1/2
-17/2*y = -1/2 // : -17/2
y = -1/2/(-17/2)
y = 1/17
y = 1/17
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