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y in (-oo:+oo)
5/6-((1/2)*y)-(5/7) = 0
(-1/2)*y+5/6-5/7 = 0
5/42-1/2*y = 0 // - 5/42
-1/2*y = -5/42 // : -1/2
y = -5/42/(-1/2)
y = 5/21
y = 5/21
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