X-6=12+3

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Solution for X-6=12+3 equation: 


Simplifying
X + -6 = 12 + 3

Reorder the terms:
-6 + X = 12 + 3

Combine like terms: 12 + 3 = 15
-6 + X = 15

Solving
-6 + X = 15

Solving for variable 'X'.

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

Add '6' to each side of the equation.
-6 + 6 + X = 15 + 6

Combine like terms: -6 + 6 = 0
0 + X = 15 + 6
X = 15 + 6

Combine like terms: 15 + 6 = 21
X = 21

Simplifying
X = 21

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