23-90=x

Solution for 23-90=x equation:

Simplifying
23 + -90 = x

Combine like terms: 23 + -90 = -67
-67 = x

Solving
-67 = 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.
-67 + -1x = x + -1x

Combine like terms: x + -1x = 0
-67 + -1x = 0

Add '67' to each side of the equation.
-67 + 67 + -1x = 0 + 67

Combine like terms: -67 + 67 = 0
0 + -1x = 0 + 67
-1x = 0 + 67

Combine like terms: 0 + 67 = 67
-1x = 67

Divide each side by '-1'.
x = -67

Simplifying
x = -67