2x+x+3=21

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Solution for 2x+x+3=21 equation: 


Simplifying
2x + x + 3 = 21

Reorder the terms:
3 + 2x + x = 21

Combine like terms: 2x + x = 3x
3 + 3x = 21

Solving
3 + 3x = 21

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 3x = 21 + -3

Combine like terms: 3 + -3 = 0
0 + 3x = 21 + -3
3x = 21 + -3

Combine like terms: 21 + -3 = 18
3x = 18

Divide each side by '3'.
x = 6

Simplifying
x = 6

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