31=4(u-4)-7u

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


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

Reorder the terms:
31 = 4(-4 + u) + -7u
31 = (-4 * 4 + u * 4) + -7u
31 = (-16 + 4u) + -7u

Combine like terms: 4u + -7u = -3u
31 = -16 + -3u

Solving
31 = -16 + -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 = -16 + -3u + 3u

Combine like terms: -3u + 3u = 0
31 + 3u = -16 + 0
31 + 3u = -16

Add '-31' to each side of the equation.
31 + -31 + 3u = -16 + -31

Combine like terms: 31 + -31 = 0
0 + 3u = -16 + -31
3u = -16 + -31

Combine like terms: -16 + -31 = -47
3u = -47

Divide each side by '3'.
u = -15.66666667

Simplifying
u = -15.66666667

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