31=4(u+7)-7u

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Solution for 31=4(u+7)-7u equation:


Simplifying
31 = 4(u + 7) + -7u

Reorder the terms:
31 = 4(7 + u) + -7u
31 = (7 * 4 + u * 4) + -7u
31 = (28 + 4u) + -7u

Combine like terms: 4u + -7u = -3u
31 = 28 + -3u

Solving
31 = 28 + -3u

Solving for variable 'u'.

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

Add '3u' to each side of the equation.
31 + 3u = 28 + -3u + 3u

Combine like terms: -3u + 3u = 0
31 + 3u = 28 + 0
31 + 3u = 28

Add '-31' to each side of the equation.
31 + -31 + 3u = 28 + -31

Combine like terms: 31 + -31 = 0
0 + 3u = 28 + -31
3u = 28 + -31

Combine like terms: 28 + -31 = -3
3u = -3

Divide each side by '3'.
u = -1

Simplifying
u = -1

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