3+(x+10)+(x+8)+(x+6)=21

Solution for 3+(x+10)+(x+8)+(x+6)=21 equation:

Simplifying
3 + (x + 10) + (x + 8) + (x + 6) = 21

Reorder the terms:
3 + (10 + x) + (x + 8) + (x + 6) = 21

Remove parenthesis around (10 + x)
3 + 10 + x + (x + 8) + (x + 6) = 21

Reorder the terms:
3 + 10 + x + (8 + x) + (x + 6) = 21

Remove parenthesis around (8 + x)
3 + 10 + x + 8 + x + (x + 6) = 21

Reorder the terms:
3 + 10 + x + 8 + x + (6 + x) = 21

Remove parenthesis around (6 + x)
3 + 10 + x + 8 + x + 6 + x = 21

Reorder the terms:
3 + 10 + 8 + 6 + x + x + x = 21

Combine like terms: 3 + 10 = 13
13 + 8 + 6 + x + x + x = 21

Combine like terms: 13 + 8 = 21
21 + 6 + x + x + x = 21

Combine like terms: 21 + 6 = 27
27 + x + x + x = 21

Combine like terms: x + x = 2x
27 + 2x + x = 21

Combine like terms: 2x + x = 3x
27 + 3x = 21

Solving
27 + 3x = 21

Solving for variable 'x'.

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

Add '-27' to each side of the equation.
27 + -27 + 3x = 21 + -27

Combine like terms: 27 + -27 = 0
0 + 3x = 21 + -27
3x = 21 + -27

Combine like terms: 21 + -27 = -6
3x = -6

Divide each side by '3'.
x = -2

Simplifying
x = -2