99=x+(x*0.10)

Solution for 99=x+(x*0.10) equation:

Simplifying
99 = x + (x * 0.10)

Reorder the terms for easier multiplication:
99 = x + (0.10x)

Combine like terms: x + (0.10x) = 1.1x
99 = 1.1x

Solving
99 = 1.1x

Solving for variable 'x'.

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

Add '-1.1x' to each side of the equation.
99 + -1.1x = 1.1x + -1.1x

Combine like terms: 1.1x + -1.1x = 0.0
99 + -1.1x = 0.0

Add '-99' to each side of the equation.
99 + -99 + -1.1x = 0.0 + -99

Combine like terms: 99 + -99 = 0
0 + -1.1x = 0.0 + -99
-1.1x = 0.0 + -99

Combine like terms: 0.0 + -99 = -99
-1.1x = -99

Divide each side by '-1.1'.
x = 90

Simplifying
x = 90