12+2a-8a=42

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Solution for 12+2a-8a=42 equation: 


Simplifying
12 + 2a + -8a = 42

Combine like terms: 2a + -8a = -6a
12 + -6a = 42

Solving
12 + -6a = 42

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + -6a = 42 + -12

Combine like terms: 12 + -12 = 0
0 + -6a = 42 + -12
-6a = 42 + -12

Combine like terms: 42 + -12 = 30
-6a = 30

Divide each side by '-6'.
a = -5

Simplifying
a = -5

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