21-x=31-3x

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Solution for 21-x=31-3x equation:


Simplifying
21 + -1x = 31 + -3x

Solving
21 + -1x = 31 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
21 + -1x + 3x = 31 + -3x + 3x

Combine like terms: -1x + 3x = 2x
21 + 2x = 31 + -3x + 3x

Combine like terms: -3x + 3x = 0
21 + 2x = 31 + 0
21 + 2x = 31

Add '-21' to each side of the equation.
21 + -21 + 2x = 31 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 31 + -21
2x = 31 + -21

Combine like terms: 31 + -21 = 10
2x = 10

Divide each side by '2'.
x = 5

Simplifying
x = 5

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