9a+21=84

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Solution for 9a+21=84 equation: 


Simplifying
9a + 21 = 84

Reorder the terms:
21 + 9a = 84

Solving
21 + 9a = 84

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + 9a = 84 + -21

Combine like terms: 21 + -21 = 0
0 + 9a = 84 + -21
9a = 84 + -21

Combine like terms: 84 + -21 = 63
9a = 63

Divide each side by '9'.
a = 7

Simplifying
a = 7

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