20-x=x+9

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Solution for 20-x=x+9 equation:


Simplifying
20 + -1x = x + 9

Reorder the terms:
20 + -1x = 9 + x

Solving
20 + -1x = 9 + 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.
20 + -1x + -1x = 9 + x + -1x

Combine like terms: -1x + -1x = -2x
20 + -2x = 9 + x + -1x

Combine like terms: x + -1x = 0
20 + -2x = 9 + 0
20 + -2x = 9

Add '-20' to each side of the equation.
20 + -20 + -2x = 9 + -20

Combine like terms: 20 + -20 = 0
0 + -2x = 9 + -20
-2x = 9 + -20

Combine like terms: 9 + -20 = -11
-2x = -11

Divide each side by '-2'.
x = 5.5

Simplifying
x = 5.5

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