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y in (-oo:+oo)
-2/3 = (1/2)*y-(5/7) // - (1/2)*y-(5/7)
5/7-((1/2)*y)-2/3 = 0
(-1/2)*y-2/3+5/7 = 0
1/21-1/2*y = 0 // - 1/21
-1/2*y = -1/21 // : -1/2
y = -1/21/(-1/2)
y = 2/21
y = 2/21
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