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y in (-oo:+oo)
-1/4 = (2/7)*y // - (2/7)*y
-((2/7)*y)-1/4 = 0
(-2/7)*y-1/4 = 0
-2/7*y-1/4 = 0 // + 1/4
-2/7*y = 1/4 // : -2/7
y = 1/4/(-2/7)
y = -7/8
y = -7/8
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