15+(6+x)=

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Solution for 15+(6+x)= equation: 


Simplifying
15 + (6 + x) = 0

Remove parenthesis around (6 + x)
15 + 6 + x = 0

Combine like terms: 15 + 6 = 21
21 + x = 0

Solving
21 + x = 0

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + x = 0 + -21

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

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

Simplifying
x = -21

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