X-21=54

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Solution for X-21=54 equation: 


Simplifying
X + -21 = 54

Reorder the terms:
-21 + X = 54

Solving
-21 + X = 54

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 = 54 + 21

Combine like terms: -21 + 21 = 0
0 + X = 54 + 21
X = 54 + 21

Combine like terms: 54 + 21 = 75
X = 75

Simplifying
X = 75

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