12-5a=3a-20

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Solution for 12-5a=3a-20 equation: 


Simplifying
12 + -5a = 3a + -20

Reorder the terms:
12 + -5a = -20 + 3a

Solving
12 + -5a = -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 + -5a + -3a = -20 + 3a + -3a

Combine like terms: -5a + -3a = -8a
12 + -8a = -20 + 3a + -3a

Combine like terms: 3a + -3a = 0
12 + -8a = -20 + 0
12 + -8a = -20

Add '-12' to each side of the equation.
12 + -12 + -8a = -20 + -12

Combine like terms: 12 + -12 = 0
0 + -8a = -20 + -12
-8a = -20 + -12

Combine like terms: -20 + -12 = -32
-8a = -32

Divide each side by '-8'.
a = 4

Simplifying
a = 4

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