x+x+8=28

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Solution for x+x+8=28 equation: 


Simplifying
x + x + 8 = 28

Reorder the terms:
8 + x + x = 28

Combine like terms: x + x = 2x
8 + 2x = 28

Solving
8 + 2x = 28

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + 2x = 28 + -8

Combine like terms: 8 + -8 = 0
0 + 2x = 28 + -8
2x = 28 + -8

Combine like terms: 28 + -8 = 20
2x = 20

Divide each side by '2'.
x = 10

Simplifying
x = 10

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