31-7+9-x=20

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Solution for 31-7+9-x=20 equation:


Simplifying
31 + -7 + 9 + -1x = 20

Combine like terms: 31 + -7 = 24
24 + 9 + -1x = 20

Combine like terms: 24 + 9 = 33
33 + -1x = 20

Solving
33 + -1x = 20

Solving for variable 'x'.

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

Add '-33' to each side of the equation.
33 + -33 + -1x = 20 + -33

Combine like terms: 33 + -33 = 0
0 + -1x = 20 + -33
-1x = 20 + -33

Combine like terms: 20 + -33 = -13
-1x = -13

Divide each side by '-1'.
x = 13

Simplifying
x = 13

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