172=7+11a

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Solution for 172=7+11a equation: 



172=7+11a

We move all terms to the left:

172-(7+11a)=0

We add all the numbers together, and all the variables

-(11a+7)+172=0

We get rid of parentheses

-11a-7+172=0

We add all the numbers together, and all the variables

-11a+165=0

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

-11a=-165

a=-165/-11

a=+15

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