3(u-7)-7u=7

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


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

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

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

Solving
-21 + -4u = 7

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 + -4u = 7 + 21

Combine like terms: -21 + 21 = 0
0 + -4u = 7 + 21
-4u = 7 + 21

Combine like terms: 7 + 21 = 28
-4u = 28

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

Simplifying
u = -7

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