3(7+u)=90

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Solution for 3(7+u)=90 equation: 


Simplifying
3(7 + u) = 90
(7 * 3 + u * 3) = 90
(21 + 3u) = 90

Solving
21 + 3u = 90

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 + 3u = 90 + -21

Combine like terms: 21 + -21 = 0
0 + 3u = 90 + -21
3u = 90 + -21

Combine like terms: 90 + -21 = 69
3u = 69

Divide each side by '3'.
u = 23

Simplifying
u = 23

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