91+9=x

Solution for 91+9=x equation:

Simplifying
91 + 9 = x

Combine like terms: 91 + 9 = 100
100 = x

Solving
100 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
100 + -1x = x + -1x

Combine like terms: x + -1x = 0
100 + -1x = 0

Add '-100' to each side of the equation.
100 + -100 + -1x = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -1x = 0 + -100
-1x = 0 + -100

Combine like terms: 0 + -100 = -100
-1x = -100

Divide each side by '-1'.
x = 100

Simplifying
x = 100