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y in (-oo:+oo)
7/8 = y+4/10 // - y+4/10
7/8-y-(4/10) = 0
7/8-y-2/5 = 0
19/40-y = 0 // - 19/40
-y = -19/40 // * -1
y = 19/40
y = 19/40
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