X+3=4+8

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Solution for X+3=4+8 equation: 


Simplifying
X + 3 = 4 + 8

Reorder the terms:
3 + X = 4 + 8

Combine like terms: 4 + 8 = 12
3 + X = 12

Solving
3 + X = 12

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + -3 + X = 12 + -3

Combine like terms: 3 + -3 = 0
0 + X = 12 + -3
X = 12 + -3

Combine like terms: 12 + -3 = 9
X = 9

Simplifying
X = 9

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