9+(-2-8)=X

Solution for 9+(-2-8)=X equation:

Simplifying
9 + (-2 + -8) = X

Combine like terms: -2 + -8 = -10
9 + (-10) = X
9 + -10 = X

Combine like terms: 9 + -10 = -1
-1 = X

Solving
-1 = 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.
-1 + -1X = X + -1X

Combine like terms: X + -1X = 0
-1 + -1X = 0

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

Combine like terms: -1 + 1 = 0
0 + -1X = 0 + 1
-1X = 0 + 1

Combine like terms: 0 + 1 = 1
-1X = 1

Divide each side by '-1'.
X = -1

Simplifying
X = -1