3x-x=40-20

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Solution for 3x-x=40-20 equation: 


Simplifying
3x + -1x = 40 + -20

Combine like terms: 3x + -1x = 2x
2x = 40 + -20

Combine like terms: 40 + -20 = 20
2x = 20

Solving
2x = 20

Solving for variable 'x'.

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

Divide each side by '2'.
x = 10

Simplifying
x = 10

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