3(u+3)-5u=21

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Solution for 3(u+3)-5u=21 equation: 


Simplifying
3(u + 3) + -5u = 21

Reorder the terms:
3(3 + u) + -5u = 21
(3 * 3 + u * 3) + -5u = 21
(9 + 3u) + -5u = 21

Combine like terms: 3u + -5u = -2u
9 + -2u = 21

Solving
9 + -2u = 21

Solving for variable 'u'.

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

Add '-9' to each side of the equation.
9 + -9 + -2u = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -2u = 21 + -9
-2u = 21 + -9

Combine like terms: 21 + -9 = 12
-2u = 12

Divide each side by '-2'.
u = -6

Simplifying
u = -6

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