[X-1]=3

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Solution for [X-1]=3 equation: 


Simplifying
[X + -1] = 3

Reorder the terms:
[-1 + X] = 3

Remove brackets around [-1 + X]
-1 + X = 3

Solving
-1 + X = 3

Solving for variable 'X'.

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

Add '1' to each side of the equation.
-1 + 1 + X = 3 + 1

Combine like terms: -1 + 1 = 0
0 + X = 3 + 1
X = 3 + 1

Combine like terms: 3 + 1 = 4
X = 4

Simplifying
X = 4

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