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y in (-oo:+oo)
1/5 = y+4/7 // - y+4/7
1/5-y-(4/7) = 0
1/5-y-4/7 = 0
-y-13/35 = 0 // + 13/35
-y = 13/35 // * -1
y = -13/35
y = -13/35
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