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y in (-oo:+oo)
7/3-(y/7) = 5/21 // - 5/21
7/3-(y/7)-(5/21) = 0
7/3-(y/7)-5/21 = 0
44/21-1/7*y = 0 // - 44/21
-1/7*y = -44/21 // : -1/7
y = -44/21/(-1/7)
y = 44/3
y = 44/3
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