-7=a+20/2

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Solution for -7=a+20/2 equation: 



-7=a+20/2

We move all terms to the left:

-7-(a+20/2)=0

We add all the numbers together, and all the variables

-(a+10)-7=0

We get rid of parentheses

-a-10-7=0

We add all the numbers together, and all the variables

-1a-17=0

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

-a=17

a=17/-1

a=-17

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