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

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


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

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

Reorder the terms:
-7 = 9 + -7u + 3u

Combine like terms: -7u + 3u = -4u
-7 = 9 + -4u

Solving
-7 = 9 + -4u

Solving for variable 'u'.

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

Add '4u' to each side of the equation.
-7 + 4u = 9 + -4u + 4u

Combine like terms: -4u + 4u = 0
-7 + 4u = 9 + 0
-7 + 4u = 9

Add '7' to each side of the equation.
-7 + 7 + 4u = 9 + 7

Combine like terms: -7 + 7 = 0
0 + 4u = 9 + 7
4u = 9 + 7

Combine like terms: 9 + 7 = 16
4u = 16

Divide each side by '4'.
u = 4

Simplifying
u = 4

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