2x+21=13

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Solution for 2x+21=13 equation: 


Simplifying
2x + 21 = 13

Reorder the terms:
21 + 2x = 13

Solving
21 + 2x = 13

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 2x = 13 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 13 + -21
2x = 13 + -21

Combine like terms: 13 + -21 = -8
2x = -8

Divide each side by '2'.
x = -4

Simplifying
x = -4

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