x+(90-a)=90

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Solution for x+(90-a)=90 equation:


Simplifying
x + (90 + -1a) = 90

Remove parenthesis around (90 + -1a)
x + 90 + -1a = 90

Reorder the terms:
90 + -1a + x = 90

Add '-90' to each side of the equation.
90 + -1a + -90 + x = 90 + -90

Reorder the terms:
90 + -90 + -1a + x = 90 + -90

Combine like terms: 90 + -90 = 0
0 + -1a + x = 90 + -90
-1a + x = 90 + -90

Combine like terms: 90 + -90 = 0
-1a + x = 0

Solving
-1a + x = 0

Solving for variable 'a'.

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

Add '-1x' to each side of the equation.
-1a + x + -1x = 0 + -1x

Combine like terms: x + -1x = 0
-1a + 0 = 0 + -1x
-1a = 0 + -1x
Remove the zero:
-1a = -1x

Divide each side by '-1'.
a = x

Simplifying
a = x

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