7x+(90-x)=21

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Solution for 7x+(90-x)=21 equation:


Simplifying
7x + (90 + -1x) = 21

Remove parenthesis around (90 + -1x)
7x + 90 + -1x = 21

Reorder the terms:
90 + 7x + -1x = 21

Combine like terms: 7x + -1x = 6x
90 + 6x = 21

Solving
90 + 6x = 21

Solving for variable 'x'.

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

Add '-90' to each side of the equation.
90 + -90 + 6x = 21 + -90

Combine like terms: 90 + -90 = 0
0 + 6x = 21 + -90
6x = 21 + -90

Combine like terms: 21 + -90 = -69
6x = -69

Divide each side by '6'.
x = -11.5

Simplifying
x = -11.5

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