42=6-2a

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Solution for 42=6-2a equation: 



42=6-2a

We move all terms to the left:

42-(6-2a)=0

We add all the numbers together, and all the variables

-(-2a+6)+42=0

We get rid of parentheses

2a-6+42=0

We add all the numbers together, and all the variables

2a+36=0

We move all terms containing a to the left, all other terms to the right

2a=-36

a=-36/2

a=-18

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