131=11-15a

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Solution for 131=11-15a equation: 



131=11-15a

We move all terms to the left:

131-(11-15a)=0

We add all the numbers together, and all the variables

-(-15a+11)+131=0

We get rid of parentheses

15a-11+131=0

We add all the numbers together, and all the variables

15a+120=0

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

15a=-120

a=-120/15

a=-8

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