2x+21=45

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Solution for 2x+21=45 equation: 


Simplifying
2x + 21 = 45

Reorder the terms:
21 + 2x = 45

Solving
21 + 2x = 45

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 = 45 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 45 + -21
2x = 45 + -21

Combine like terms: 45 + -21 = 24
2x = 24

Divide each side by '2'.
x = 12

Simplifying
x = 12

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