12-4=a

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Solution for 12-4=a equation:


Simplifying
12 + -4 = a

Combine like terms: 12 + -4 = 8
8 = a

Solving
8 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
8 + -1a = a + -1a

Combine like terms: a + -1a = 0
8 + -1a = 0

Add '-8' to each side of the equation.
8 + -8 + -1a = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1a = 0 + -8
-1a = 0 + -8

Combine like terms: 0 + -8 = -8
-1a = -8

Divide each side by '-1'.
a = 8

Simplifying
a = 8

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