3(u-3)-3(4-u)=

Solution for 3(u-3)-3(4-u)= equation:

Simplifying
3(u + -3) + -3(4 + -1u) = 0

Reorder the terms:
3(-3 + u) + -3(4 + -1u) = 0
(-3 * 3 + u * 3) + -3(4 + -1u) = 0
(-9 + 3u) + -3(4 + -1u) = 0
-9 + 3u + (4 * -3 + -1u * -3) = 0
-9 + 3u + (-12 + 3u) = 0

Reorder the terms:
-9 + -12 + 3u + 3u = 0

Combine like terms: -9 + -12 = -21
-21 + 3u + 3u = 0

Combine like terms: 3u + 3u = 6u
-21 + 6u = 0

Solving
-21 + 6u = 0

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 + 6u = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 6u = 0 + 21
6u = 0 + 21

Combine like terms: 0 + 21 = 21
6u = 21

Divide each side by '6'.
u = 3.5

Simplifying
u = 3.5