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You want to attain the form Ax + By = C, that is the x and y terms on the left side of the equation and a constant on the right side. You have 3y = 4x + 1 so you need to "move" the term 4x to the left side. This you can do by adding 4x to each side.
This is in standard form but it seems your son's textbook wants the coefficient of x to be positive not negative. This you can achieve by multiplying each side of the equation by 1.
Multiplying 1 through the left side gives
I hope this helps,  


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