5, if I'm not mistaken.
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in respect to y 2y*3-y collecting the three times the coefficient of y which is 2 6y-y 6y-y=5y the derivative of 5y in respect to y is 5.
5y + 5y = 10y
-3
5y+8=7y subtract 5y from each side , 5y+8=7y -5y -5y 8=2y /2 /2 4=y
If: 4x = 5y Then: x = 5y/4