a+12=20-3a

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Solution for a+12=20-3a equation:


Simplifying
a + 12 = 20 + -3a

Reorder the terms:
12 + a = 20 + -3a

Solving
12 + a = 20 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
12 + a + 3a = 20 + -3a + 3a

Combine like terms: a + 3a = 4a
12 + 4a = 20 + -3a + 3a

Combine like terms: -3a + 3a = 0
12 + 4a = 20 + 0
12 + 4a = 20

Add '-12' to each side of the equation.
12 + -12 + 4a = 20 + -12

Combine like terms: 12 + -12 = 0
0 + 4a = 20 + -12
4a = 20 + -12

Combine like terms: 20 + -12 = 8
4a = 8

Divide each side by '4'.
a = 2

Simplifying
a = 2

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