9=-5u+3(u+7)

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Solution for 9=-5u+3(u+7) equation:


Simplifying
9 = -5u + 3(u + 7)

Reorder the terms:
9 = -5u + 3(7 + u)
9 = -5u + (7 * 3 + u * 3)
9 = -5u + (21 + 3u)

Reorder the terms:
9 = 21 + -5u + 3u

Combine like terms: -5u + 3u = -2u
9 = 21 + -2u

Solving
9 = 21 + -2u

Solving for variable 'u'.

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

Add '2u' to each side of the equation.
9 + 2u = 21 + -2u + 2u

Combine like terms: -2u + 2u = 0
9 + 2u = 21 + 0
9 + 2u = 21

Add '-9' to each side of the equation.
9 + -9 + 2u = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2u = 21 + -9
2u = 21 + -9

Combine like terms: 21 + -9 = 12
2u = 12

Divide each side by '2'.
u = 6

Simplifying
u = 6

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