3+5+a=12

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Solution for 3+5+a=12 equation: 


Simplifying
3 + 5 + a = 12

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

Solving
8 + a = 12

Solving for variable 'a'.

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

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

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

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

Simplifying
a = 4

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