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y in (-oo:+oo)
(2/7)*y-((1/2)*y) = (3/4)*y+1 // - (3/4)*y+1
(2/7)*y-((1/2)*y)-((3/4)*y)-1 = 0
(2/7)*y+(-1/2)*y+(-3/4)*y-1 = 0
-27/28*y-1 = 0 // + 1
-27/28*y = 1 // : -27/28
y = 1/(-27/28)
y = -28/27
y = -28/27
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