78-[9-x]=

Solution for 78-[9-x]= equation:

Simplifying
78 + -1[9 + -1x] = 0
78 + [9 * -1 + -1x * -1] = 0
78 + [-9 + 1x] = 0

Combine like terms: 78 + -9 = 69
69 + 1x = 0

Solving
69 + 1x = 0

Solving for variable 'x'.

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

Add '-69' to each side of the equation.
69 + -69 + 1x = 0 + -69

Combine like terms: 69 + -69 = 0
0 + 1x = 0 + -69
1x = 0 + -69

Combine like terms: 0 + -69 = -69
1x = -69

Divide each side by '1'.
x = -69

Simplifying
x = -69