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y in (-oo:+oo)
5/7 = (5/4)*y // - (5/4)*y
5/7-((5/4)*y) = 0
(-5/4)*y+5/7 = 0
5/7-5/4*y = 0 // - 5/7
-5/4*y = -5/7 // : -5/4
y = -5/7/(-5/4)
y = 4/7
y = 4/7
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