6a-a-20a-(-7a)+11a=-18

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Solution for 6a-a-20a-(-7a)+11a=-18 equation: 



6a-a-20a-(-7a)+11a=-18

We move all terms to the left:

6a-a-20a-(-7a)+11a-(-18)=0

We add all the numbers together, and all the variables

-4a-(-7a)+18=0

We get rid of parentheses

-4a+7a+18=0

We add all the numbers together, and all the variables

3a+18=0

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

3a=-18

a=-18/3

a=-6

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