28-(-9)=x

Solution for 28-(-9)=x equation:

Simplifying
28 + -1(-9) = x

Multiply -1 * -9
28 + 9 = x

Combine like terms: 28 + 9 = 37
37 = x

Solving
37 = 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.
37 + -1x = x + -1x

Combine like terms: x + -1x = 0
37 + -1x = 0

Add '-37' to each side of the equation.
37 + -37 + -1x = 0 + -37

Combine like terms: 37 + -37 = 0
0 + -1x = 0 + -37
-1x = 0 + -37

Combine like terms: 0 + -37 = -37
-1x = -37

Divide each side by '-1'.
x = 37

Simplifying
x = 37