-30=-a/2-9

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Solution for -30=-a/2-9 equation: 



-30=-a/2-9

We move all terms to the left:

-30-(-a/2-9)=0

We get rid of parentheses

a/2+9-30=0

We multiply all the terms by the denominator


a+9*2-30*2=0

We add all the numbers together, and all the variables

a-42=0

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

a=42

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