3u+7(u-3)=-31

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Solution for 3u+7(u-3)=-31 equation:


Simplifying
3u + 7(u + -3) = -31

Reorder the terms:
3u + 7(-3 + u) = -31
3u + (-3 * 7 + u * 7) = -31
3u + (-21 + 7u) = -31

Reorder the terms:
-21 + 3u + 7u = -31

Combine like terms: 3u + 7u = 10u
-21 + 10u = -31

Solving
-21 + 10u = -31

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 + 10u = -31 + 21

Combine like terms: -21 + 21 = 0
0 + 10u = -31 + 21
10u = -31 + 21

Combine like terms: -31 + 21 = -10
10u = -10

Divide each side by '10'.
u = -1

Simplifying
u = -1

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