8a-13=21

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Solution for 8a-13=21 equation: 


Simplifying
8a + -13 = 21

Reorder the terms:
-13 + 8a = 21

Solving
-13 + 8a = 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 + 8a = 21 + 13

Combine like terms: -13 + 13 = 0
0 + 8a = 21 + 13
8a = 21 + 13

Combine like terms: 21 + 13 = 34
8a = 34

Divide each side by '8'.
a = 4.25

Simplifying
a = 4.25

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