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

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


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

Reorder the terms:
-31 = 3(3 + u) + 7u
-31 = (3 * 3 + u * 3) + 7u
-31 = (9 + 3u) + 7u

Combine like terms: 3u + 7u = 10u
-31 = 9 + 10u

Solving
-31 = 9 + 10u

Solving for variable 'u'.

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

Add '-10u' to each side of the equation.
-31 + -10u = 9 + 10u + -10u

Combine like terms: 10u + -10u = 0
-31 + -10u = 9 + 0
-31 + -10u = 9

Add '31' to each side of the equation.
-31 + 31 + -10u = 9 + 31

Combine like terms: -31 + 31 = 0
0 + -10u = 9 + 31
-10u = 9 + 31

Combine like terms: 9 + 31 = 40
-10u = 40

Divide each side by '-10'.
u = -4

Simplifying
u = -4

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