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y in (-oo:+oo)
4/7 = 3*y // - 3*y
4/7-(3*y) = 0
4/7-3*y = 0
4/7-3*y = 0 // - 4/7
-3*y = -4/7 // : -3
y = -4/7/(-3)
y = 4/21
y = 4/21
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