3+-9=X

Solution for 3+-9=X equation:

Simplifying
3 + -9 = X

Combine like terms: 3 + -9 = -6
-6 = X

Solving
-6 = 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.
-6 + -1X = X + -1X

Combine like terms: X + -1X = 0
-6 + -1X = 0

Add '6' to each side of the equation.
-6 + 6 + -1X = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1X = 0 + 6
-1X = 0 + 6

Combine like terms: 0 + 6 = 6
-1X = 6

Divide each side by '-1'.
X = -6

Simplifying
X = -6