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y in (-oo:+oo)
-4/3 = (1/2)*y-(5/7) // - (1/2)*y-(5/7)
5/7-((1/2)*y)-4/3 = 0
(-1/2)*y-4/3+5/7 = 0
-1/2*y-13/21 = 0 // + 13/21
-1/2*y = 13/21 // : -1/2
y = 13/21/(-1/2)
y = -26/21
y = -26/21
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