-3u+7(u+7)=21

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Solution for -3u+7(u+7)=21 equation:


Simplifying
-3u + 7(u + 7) = 21

Reorder the terms:
-3u + 7(7 + u) = 21
-3u + (7 * 7 + u * 7) = 21
-3u + (49 + 7u) = 21

Reorder the terms:
49 + -3u + 7u = 21

Combine like terms: -3u + 7u = 4u
49 + 4u = 21

Solving
49 + 4u = 21

Solving for variable 'u'.

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

Add '-49' to each side of the equation.
49 + -49 + 4u = 21 + -49

Combine like terms: 49 + -49 = 0
0 + 4u = 21 + -49
4u = 21 + -49

Combine like terms: 21 + -49 = -28
4u = -28

Divide each side by '4'.
u = -7

Simplifying
u = -7

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