4-a-7=40

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Solution for 4-a-7=40 equation: 



4-a-7=40

We move all terms to the left:

4-a-7-(40)=0

We add all the numbers together, and all the variables

-1a-43=0

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

-a=43

a=43/-1

a=-43

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