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2/3 = y/7-(2/7) // - y/7-(2/7)
2/3-(y/7)+2/7 = 0
20/21-1/7*y = 0 // - 20/21
-1/7*y = -20/21 // : -1/7
y = -20/21/(-1/7)
y = 20/3
y = 20/3
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