2a+12=31-3a

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Solution for 2a+12=31-3a equation: 


Simplifying
2a + 12 = 31 + -3a

Reorder the terms:
12 + 2a = 31 + -3a

Solving
12 + 2a = 31 + -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 + 2a + 3a = 31 + -3a + 3a

Combine like terms: 2a + 3a = 5a
12 + 5a = 31 + -3a + 3a

Combine like terms: -3a + 3a = 0
12 + 5a = 31 + 0
12 + 5a = 31

Add '-12' to each side of the equation.
12 + -12 + 5a = 31 + -12

Combine like terms: 12 + -12 = 0
0 + 5a = 31 + -12
5a = 31 + -12

Combine like terms: 31 + -12 = 19
5a = 19

Divide each side by '5'.
a = 3.8

Simplifying
a = 3.8

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