45=7u+2u

Solution for 45=7u+2u equation:

Simplifying
45 = 7u + 2u

Combine like terms: 7u + 2u = 9u
45 = 9u

Solving
45 = 9u

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-9u' to each side of the equation.
45 + -9u = 9u + -9u

Combine like terms: 9u + -9u = 0
45 + -9u = 0

Add '-45' to each side of the equation.
45 + -45 + -9u = 0 + -45

Combine like terms: 45 + -45 = 0
0 + -9u = 0 + -45
-9u = 0 + -45

Combine like terms: 0 + -45 = -45
-9u = -45

Divide each side by '-9'.
u = 5

Simplifying
u = 5