9=7(u+7)+3u

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Solution for 9=7(u+7)+3u equation:


Simplifying
9 = 7(u + 7) + 3u

Reorder the terms:
9 = 7(7 + u) + 3u
9 = (7 * 7 + u * 7) + 3u
9 = (49 + 7u) + 3u

Combine like terms: 7u + 3u = 10u
9 = 49 + 10u

Solving
9 = 49 + 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.
9 + -10u = 49 + 10u + -10u

Combine like terms: 10u + -10u = 0
9 + -10u = 49 + 0
9 + -10u = 49

Add '-9' to each side of the equation.
9 + -9 + -10u = 49 + -9

Combine like terms: 9 + -9 = 0
0 + -10u = 49 + -9
-10u = 49 + -9

Combine like terms: 49 + -9 = 40
-10u = 40

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

Simplifying
u = -4

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