42=-7a+21

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Solution for 42=-7a+21 equation: 



42=-7a+21

We move all terms to the left:

42-(-7a+21)=0

We get rid of parentheses

7a-21+42=0

We add all the numbers together, and all the variables

7a+21=0

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

7a=-21

a=-21/7

a=-3

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