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y in (-oo:+oo)
-2/3 = (-5/7)*y-(1/2) // - (-5/7)*y-(1/2)
1/2-((-5/7)*y)-2/3 = 0
(5/7)*y-2/3+1/2 = 0
5/7*y-1/6 = 0 // + 1/6
5/7*y = 1/6 // : 5/7
y = 1/6/5/7
y = 7/30
y = 7/30
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