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y in (-oo:+oo)
2/3-(1/7) = y/5 // - y/5
2/3-(y/5)-(1/7) = 0
2/3-(y/5)-1/7 = 0
11/21-1/5*y = 0 // - 11/21
-1/5*y = -11/21 // : -1/5
y = -11/21/(-1/5)
y = 55/21
y = 55/21
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