8=20-X

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Solution for 8=20-X equation: 


Simplifying
8 = 20 + -1X

Solving
8 = 20 + -1X

Solving for variable 'X'.

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

Add 'X' to each side of the equation.
8 + X = 20 + -1X + X

Combine like terms: -1X + X = 0
8 + X = 20 + 0
8 + X = 20

Add '-8' to each side of the equation.
8 + -8 + X = 20 + -8

Combine like terms: 8 + -8 = 0
0 + X = 20 + -8
X = 20 + -8

Combine like terms: 20 + -8 = 12
X = 12

Simplifying
X = 12

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