u-21+u-21=u+19

Solution for u-21+u-21=u+19 equation:

Simplifying
u + -21 + u + -21 = u + 19

Reorder the terms:
-21 + -21 + u + u = u + 19

Combine like terms: -21 + -21 = -42
-42 + u + u = u + 19

Combine like terms: u + u = 2u
-42 + 2u = u + 19

Reorder the terms:
-42 + 2u = 19 + u

Solving
-42 + 2u = 19 + u

Solving for variable 'u'.

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

Add '-1u' to each side of the equation.
-42 + 2u + -1u = 19 + u + -1u

Combine like terms: 2u + -1u = 1u
-42 + 1u = 19 + u + -1u

Combine like terms: u + -1u = 0
-42 + 1u = 19 + 0
-42 + 1u = 19

Add '42' to each side of the equation.
-42 + 42 + 1u = 19 + 42

Combine like terms: -42 + 42 = 0
0 + 1u = 19 + 42
1u = 19 + 42

Combine like terms: 19 + 42 = 61
1u = 61

Divide each side by '1'.
u = 61

Simplifying
u = 61