-2+10-21=x

Solution for -2+10-21=x equation:

Simplifying
-2 + 10 + -21 = x

Combine like terms: -2 + 10 = 8
8 + -21 = x

Combine like terms: 8 + -21 = -13
-13 = x

Solving
-13 = 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.
-13 + -1x = x + -1x

Combine like terms: x + -1x = 0
-13 + -1x = 0

Add '13' to each side of the equation.
-13 + 13 + -1x = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -1x = 0 + 13
-1x = 0 + 13

Combine like terms: 0 + 13 = 13
-1x = 13

Divide each side by '-1'.
x = -13

Simplifying
x = -13