6+15+X=

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Solution for 6+15+X= equation: 


Simplifying
6 + 15 + X = 0

Combine like terms: 6 + 15 = 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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