x+7+(x+14)+(x+21)=126

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Solution for x+7+(x+14)+(x+21)=126 equation:


Simplifying
x + 7 + (x + 14) + (x + 21) = 126

Reorder the terms:
x + 7 + (14 + x) + (x + 21) = 126

Remove parenthesis around (14 + x)
x + 7 + 14 + x + (x + 21) = 126

Reorder the terms:
x + 7 + 14 + x + (21 + x) = 126

Remove parenthesis around (21 + x)
x + 7 + 14 + x + 21 + x = 126

Reorder the terms:
7 + 14 + 21 + x + x + x = 126

Combine like terms: 7 + 14 = 21
21 + 21 + x + x + x = 126

Combine like terms: 21 + 21 = 42
42 + x + x + x = 126

Combine like terms: x + x = 2x
42 + 2x + x = 126

Combine like terms: 2x + x = 3x
42 + 3x = 126

Solving
42 + 3x = 126

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + 3x = 126 + -42

Combine like terms: 42 + -42 = 0
0 + 3x = 126 + -42
3x = 126 + -42

Combine like terms: 126 + -42 = 84
3x = 84

Divide each side by '3'.
x = 28

Simplifying
x = 28

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