(X+21)=111

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Solution for (X+21)=111 equation: 


Simplifying
(X + 21) = 111

Reorder the terms:
(21 + X) = 111

Remove parenthesis around (21 + X)
21 + X = 111

Solving
21 + X = 111

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 = 111 + -21

Combine like terms: 21 + -21 = 0
0 + X = 111 + -21
X = 111 + -21

Combine like terms: 111 + -21 = 90
X = 90

Simplifying
X = 90

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