7a=-(2a-18)

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Solution for 7a=-(2a-18) equation: 



7a=-(2a-18)

We move all terms to the left:

7a-(-(2a-18))=0



We calculate terms in parentheses: -(-(2a-18)), so:

-(2a-18)

We get rid of parentheses

-2a+18

Back to the equation:

-(-2a+18)



We get rid of parentheses

7a+2a-18=0

We add all the numbers together, and all the variables

9a-18=0

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

9a=18

a=18/9

a=2

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