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y in (-oo:+oo)
-7/5 = (1/2)*y-(2/3) // - (1/2)*y-(2/3)
2/3-((1/2)*y)-7/5 = 0
(-1/2)*y-7/5+2/3 = 0
-1/2*y-11/15 = 0 // + 11/15
-1/2*y = 11/15 // : -1/2
y = 11/15/(-1/2)
y = -22/15
y = -22/15
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