7(3-u)+u-2u=5

Solution for 7(3-u)+u-2u=5 equation:

Simplifying
7(3 + -1u) + u + -2u = 5
(3 * 7 + -1u * 7) + u + -2u = 5
(21 + -7u) + u + -2u = 5

Combine like terms: -7u + u = -6u
21 + -6u + -2u = 5

Combine like terms: -6u + -2u = -8u
21 + -8u = 5

Solving
21 + -8u = 5

Solving for variable 'u'.

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

Add '-21' to each side of the equation.
21 + -21 + -8u = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -8u = 5 + -21
-8u = 5 + -21

Combine like terms: 5 + -21 = -16
-8u = -16

Divide each side by '-8'.
u = 2

Simplifying
u = 2