2x+21=3-x

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Solution for 2x+21=3-x equation:


Simplifying
2x + 21 = 3 + -1x

Reorder the terms:
21 + 2x = 3 + -1x

Solving
21 + 2x = 3 + -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.
21 + 2x + x = 3 + -1x + x

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

Combine like terms: -1x + x = 0
21 + 3x = 3 + 0
21 + 3x = 3

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

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

Combine like terms: 3 + -21 = -18
3x = -18

Divide each side by '3'.
x = -6

Simplifying
x = -6

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