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