9x-(9+x)=81

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Solution for 9x-(9+x)=81 equation:


Simplifying
9x + -1(9 + x) = 81
9x + (9 * -1 + x * -1) = 81
9x + (-9 + -1x) = 81

Reorder the terms:
-9 + 9x + -1x = 81

Combine like terms: 9x + -1x = 8x
-9 + 8x = 81

Solving
-9 + 8x = 81

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 8x = 81 + 9

Combine like terms: -9 + 9 = 0
0 + 8x = 81 + 9
8x = 81 + 9

Combine like terms: 81 + 9 = 90
8x = 90

Divide each side by '8'.
x = 11.25

Simplifying
x = 11.25

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