3*X=20-X

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Solution for 3*X=20-X equation: 


Simplifying
3X = 20 + -1X

Solving
3X = 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.
3X + X = 20 + -1X + X

Combine like terms: 3X + X = 4X
4X = 20 + -1X + X

Combine like terms: -1X + X = 0
4X = 20 + 0
4X = 20

Divide each side by '4'.
X = 5

Simplifying
X = 5

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