3(u-7)+6u=15

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Solution for 3(u-7)+6u=15 equation: 


Simplifying
3(u + -7) + 6u = 15

Reorder the terms:
3(-7 + u) + 6u = 15
(-7 * 3 + u * 3) + 6u = 15
(-21 + 3u) + 6u = 15

Combine like terms: 3u + 6u = 9u
-21 + 9u = 15

Solving
-21 + 9u = 15

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 + 9u = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 9u = 15 + 21
9u = 15 + 21

Combine like terms: 15 + 21 = 36
9u = 36

Divide each side by '9'.
u = 4

Simplifying
u = 4

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