7(u-90)=21

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Solution for 7(u-90)=21 equation:


Simplifying
7(u + -90) = 21

Reorder the terms:
7(-90 + u) = 21
(-90 * 7 + u * 7) = 21
(-630 + 7u) = 21

Solving
-630 + 7u = 21

Solving for variable 'u'.

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

Add '630' to each side of the equation.
-630 + 630 + 7u = 21 + 630

Combine like terms: -630 + 630 = 0
0 + 7u = 21 + 630
7u = 21 + 630

Combine like terms: 21 + 630 = 651
7u = 651

Divide each side by '7'.
u = 93

Simplifying
u = 93

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