42=2-4a

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Solution for 42=2-4a equation: 



42=2-4a

We move all terms to the left:

42-(2-4a)=0

We add all the numbers together, and all the variables

-(-4a+2)+42=0

We get rid of parentheses

4a-2+42=0

We add all the numbers together, and all the variables

4a+40=0

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

4a=-40

a=-40/4

a=-10

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