x+x+x=15+6

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Solution for x+x+x=15+6 equation: 


Simplifying
x + x + x = 15 + 6

Combine like terms: x + x = 2x
2x + x = 15 + 6

Combine like terms: 2x + x = 3x
3x = 15 + 6

Combine like terms: 15 + 6 = 21
3x = 21

Solving
3x = 21

Solving for variable 'x'.

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

Divide each side by '3'.
x = 7

Simplifying
x = 7

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