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

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


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

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

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

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

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

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

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

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

Solving
11 + 2x = 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 + 2x = 21 + -11

Combine like terms: 11 + -11 = 0
0 + 2x = 21 + -11
2x = 21 + -11

Combine like terms: 21 + -11 = 10
2x = 10

Divide each side by '2'.
x = 5

Simplifying
x = 5

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