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4y+y-4=3y
Variable y cannot be equal to 4 since division by zero is not defined. Multiply both sides of the equation by y-4.
5y-4=3y
Combine 4y and y to get 5y.
5y-4-3y=0
Subtract 3y from both sides.
2y-4=0
Combine 5y and -3y to get 2y.
2y=4
Add 4 to both sides. Anything plus zero gives itself.
y=\frac{4}{2}
Divide both sides by 2.
y=2
Divide 4 by 2 to get 2.