3x-x+2x=20

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Solution for 3x-x+2x=20 equation: 


Simplifying
3x + -1x + 2x = 20

Combine like terms: 3x + -1x = 2x
2x + 2x = 20

Combine like terms: 2x + 2x = 4x
4x = 20

Solving
4x = 20

Solving for variable 'x'.

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

Divide each side by '4'.
x = 5

Simplifying
x = 5

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