X-9=4x+12

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Solution for X-9=4x+12 equation: 


Simplifying
X + -9 = 4x + 12

Reorder the terms:
-9 + X = 4x + 12

Reorder the terms:
-9 + X = 12 + 4x

Solving
-9 + X = 12 + 4x

Solving for variable 'X'.

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

Add '9' to each side of the equation.
-9 + 9 + X = 12 + 9 + 4x

Combine like terms: -9 + 9 = 0
0 + X = 12 + 9 + 4x
X = 12 + 9 + 4x

Combine like terms: 12 + 9 = 21
X = 21 + 4x

Simplifying
X = 21 + 4x

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