2x+21+9=x+21

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


Simplifying
2x + 21 + 9 = x + 21

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

Combine like terms: 21 + 9 = 30
30 + 2x = x + 21

Reorder the terms:
30 + 2x = 21 + x

Solving
30 + 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.
30 + 2x + -1x = 21 + x + -1x

Combine like terms: 2x + -1x = 1x
30 + 1x = 21 + x + -1x

Combine like terms: x + -1x = 0
30 + 1x = 21 + 0
30 + 1x = 21

Add '-30' to each side of the equation.
30 + -30 + 1x = 21 + -30

Combine like terms: 30 + -30 = 0
0 + 1x = 21 + -30
1x = 21 + -30

Combine like terms: 21 + -30 = -9
1x = -9

Divide each side by '1'.
x = -9

Simplifying
x = -9

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