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