2x+20+9=x+21

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Solution for 2x+20+9=x+21 equation:


Simplifying
2x + 20 + 9 = x + 21

Reorder the terms:
20 + 9 + 2x = x + 21

Combine like terms: 20 + 9 = 29
29 + 2x = x + 21

Reorder the terms:
29 + 2x = 21 + x

Solving
29 + 2x = 21 + 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.
29 + 2x + -1x = 21 + x + -1x

Combine like terms: 2x + -1x = 1x
29 + 1x = 21 + x + -1x

Combine like terms: x + -1x = 0
29 + 1x = 21 + 0
29 + 1x = 21

Add '-29' to each side of the equation.
29 + -29 + 1x = 21 + -29

Combine like terms: 29 + -29 = 0
0 + 1x = 21 + -29
1x = 21 + -29

Combine like terms: 21 + -29 = -8
1x = -8

Divide each side by '1'.
x = -8

Simplifying
x = -8

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