x+x+1=9

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Solution for x+x+1=9 equation: 


Simplifying
x + x + 1 = 9

Reorder the terms:
1 + x + x = 9

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

Solving
1 + 2x = 9

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 = 9 + -1

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

Combine like terms: 9 + -1 = 8
2x = 8

Divide each side by '2'.
x = 4

Simplifying
x = 4

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