12=3X-X-12

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Solution for 12=3X-X-12 equation:


Simplifying
12 = 3X + -1X + -12

Reorder the terms:
12 = -12 + 3X + -1X

Combine like terms: 3X + -1X = 2X
12 = -12 + 2X

Solving
12 = -12 + 2X

Solving for variable 'X'.

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

Add '-2X' to each side of the equation.
12 + -2X = -12 + 2X + -2X

Combine like terms: 2X + -2X = 0
12 + -2X = -12 + 0
12 + -2X = -12

Add '-12' to each side of the equation.
12 + -12 + -2X = -12 + -12

Combine like terms: 12 + -12 = 0
0 + -2X = -12 + -12
-2X = -12 + -12

Combine like terms: -12 + -12 = -24
-2X = -24

Divide each side by '-2'.
X = 12

Simplifying
X = 12

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