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y in (-oo:+oo)
1/7+2/7 = (5/3)*y-((1/3)*y) // - (5/3)*y-((1/3)*y)
(1/3)*y-((5/3)*y)+1/7+2/7 = 0
(-5/3)*y+(1/3)*y+1/7+2/7 = 0
3/7-4/3*y = 0 // - 3/7
-4/3*y = -3/7 // : -4/3
y = -3/7/(-4/3)
y = 9/28
y = 9/28
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