(2x+8)+(x+3)=21

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Solution for (2x+8)+(x+3)=21 equation: 


Simplifying
(2x + 8) + (x + 3) = 21

Reorder the terms:
(8 + 2x) + (x + 3) = 21

Remove parenthesis around (8 + 2x)
8 + 2x + (x + 3) = 21

Reorder the terms:
8 + 2x + (3 + x) = 21

Remove parenthesis around (3 + x)
8 + 2x + 3 + x = 21

Reorder the terms:
8 + 3 + 2x + x = 21

Combine like terms: 8 + 3 = 11
11 + 2x + x = 21

Combine like terms: 2x + x = 3x
11 + 3x = 21

Solving
11 + 3x = 21

Solving for variable 'x'.

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

Add '-11' to each side of the equation.
11 + -11 + 3x = 21 + -11

Combine like terms: 11 + -11 = 0
0 + 3x = 21 + -11
3x = 21 + -11

Combine like terms: 21 + -11 = 10
3x = 10

Divide each side by '3'.
x = 3.333333333

Simplifying
x = 3.333333333

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