4-(-9)-(-18)=x

Solution for 4-(-9)-(-18)=x equation:

Simplifying
4 + -1(-9) + -1(-18) = x

Multiply -1 * -9
4 + 9 + -1(-18) = x

Multiply -1 * -18
4 + 9 + 18 = x

Combine like terms: 4 + 9 = 13
13 + 18 = x

Combine like terms: 13 + 18 = 31
31 = x

Solving
31 = 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.
31 + -1x = x + -1x

Combine like terms: x + -1x = 0
31 + -1x = 0

Add '-31' to each side of the equation.
31 + -31 + -1x = 0 + -31

Combine like terms: 31 + -31 = 0
0 + -1x = 0 + -31
-1x = 0 + -31

Combine like terms: 0 + -31 = -31
-1x = -31

Divide each side by '-1'.
x = 31

Simplifying
x = 31