9+5a=21-9

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


Simplifying
9 + 5a = 21 + -9

Combine like terms: 21 + -9 = 12
9 + 5a = 12

Solving
9 + 5a = 12

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + 5a = 12 + -9

Combine like terms: 9 + -9 = 0
0 + 5a = 12 + -9
5a = 12 + -9

Combine like terms: 12 + -9 = 3
5a = 3

Divide each side by '5'.
a = 0.6

Simplifying
a = 0.6

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