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y in (-oo:+oo)
3/5 = y/7 // - y/7
3/5-(y/7) = 0
3/5-1/7*y = 0 // - 3/5
-1/7*y = -3/5 // : -1/7
y = -3/5/(-1/7)
y = 21/5
y = 21/5
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