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y in (-oo:+oo)
(5/7)*y-(7/2) = (7/2)*y-(1/4) // - (7/2)*y-(1/4)
(5/7)*y-((7/2)*y)-(7/2)+1/4 = 0
(5/7)*y+(-7/2)*y-7/2+1/4 = 0
-39/14*y-13/4 = 0 // + 13/4
-39/14*y = 13/4 // : -39/14
y = 13/4/(-39/14)
y = -7/6
y = -7/6
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