12a-84=5a

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Solution for 12a-84=5a equation:


Simplifying
12a + -84 = 5a

Reorder the terms:
-84 + 12a = 5a

Solving
-84 + 12a = 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.
-84 + 12a + -5a = 5a + -5a

Combine like terms: 12a + -5a = 7a
-84 + 7a = 5a + -5a

Combine like terms: 5a + -5a = 0
-84 + 7a = 0

Add '84' to each side of the equation.
-84 + 84 + 7a = 0 + 84

Combine like terms: -84 + 84 = 0
0 + 7a = 0 + 84
7a = 0 + 84

Combine like terms: 0 + 84 = 84
7a = 84

Divide each side by '7'.
a = 12

Simplifying
a = 12

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