-18=11a+7+8

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Solution for -18=11a+7+8 equation: 



-18=11a+7+8

We move all terms to the left:

-18-(11a+7+8)=0

We add all the numbers together, and all the variables

-(11a+15)-18=0

We get rid of parentheses

-11a-15-18=0

We add all the numbers together, and all the variables

-11a-33=0

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

-11a=33

a=33/-11

a=-3

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