12=4+5a-a

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Solution for 12=4+5a-a equation:


Simplifying
12 = 4 + 5a + -1a

Combine like terms: 5a + -1a = 4a
12 = 4 + 4a

Solving
12 = 4 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
12 + -4a = 4 + 4a + -4a

Combine like terms: 4a + -4a = 0
12 + -4a = 4 + 0
12 + -4a = 4

Add '-12' to each side of the equation.
12 + -12 + -4a = 4 + -12

Combine like terms: 12 + -12 = 0
0 + -4a = 4 + -12
-4a = 4 + -12

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

Divide each side by '-4'.
a = 2

Simplifying
a = 2

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