-7+8a+28-a=-42

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Solution for -7+8a+28-a=-42 equation: 



-7+8a+28-a=-42

We move all terms to the left:

-7+8a+28-a-(-42)=0

We add all the numbers together, and all the variables

7a+63=0

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

7a=-63

a=-63/7

a=-9

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