2a+13=21

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Solution for 2a+13=21 equation: 


Simplifying
2a + 13 = 21

Reorder the terms:
13 + 2a = 21

Solving
13 + 2a = 21

Solving for variable 'a'.

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

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

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

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

Divide each side by '2'.
a = 4

Simplifying
a = 4

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