8a-9=5a+21

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Solution for 8a-9=5a+21 equation:


Simplifying
8a + -9 = 5a + 21

Reorder the terms:
-9 + 8a = 5a + 21

Reorder the terms:
-9 + 8a = 21 + 5a

Solving
-9 + 8a = 21 + 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
-9 + 8a + -5a = 21 + 5a + -5a

Combine like terms: 8a + -5a = 3a
-9 + 3a = 21 + 5a + -5a

Combine like terms: 5a + -5a = 0
-9 + 3a = 21 + 0
-9 + 3a = 21

Add '9' to each side of the equation.
-9 + 9 + 3a = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 3a = 21 + 9
3a = 21 + 9

Combine like terms: 21 + 9 = 30
3a = 30

Divide each side by '3'.
a = 10

Simplifying
a = 10

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