x+x+1=21

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Solution for x+x+1=21 equation: 


Simplifying
x + x + 1 = 21

Reorder the terms:
1 + x + x = 21

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

Solving
1 + 2x = 21

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + 2x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 2x = 21 + -1
2x = 21 + -1

Combine like terms: 21 + -1 = 20
2x = 20

Divide each side by '2'.
x = 10

Simplifying
x = 10

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