X(4)=12

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Solution for X(4)=12 equation: 


Simplifying
X(4) = 12

Reorder the terms for easier multiplication:
4X = 12

Solving
4X = 12

Solving for variable 'X'.

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

Divide each side by '4'.
X = 3

Simplifying
X = 3

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