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y in (-oo:+oo)
y/7+1/3 = 4*y // - 4*y
y/7-(4*y)+1/3 = 0
y/7-4*y+1/3 = 0
1/3-27/7*y = 0 // - 1/3
-27/7*y = -1/3 // : -27/7
y = -1/3/(-27/7)
y = 7/81
y = 7/81
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