131=a1+(10-1)12

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Solution for 131=a1+(10-1)12 equation: 



131=a1+(10-1)12

We move all terms to the left:

131-(a1+(10-1)12)=0

We add all the numbers together, and all the variables

-(a1+912)+131=0

We get rid of parentheses

-a1-912+131=0

We add all the numbers together, and all the variables

-1a-781=0

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

-a=781

a=781/-1

a=-781

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