Move all terms not containing u to the right side of the equation.
Subtract 7 from both sides of the equation.
Subtract 7 from 57.
Divide each term by 5 and simplify.
Divide each term in 5u=50 by 5.
Cancel the common factor of 5.
Cancel the common factor.
Divide u by 1.
Divide 50 by 5.
Solve for u 7+5u=57