91=77+x

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Solution for 91=77+x equation: 



91=77+x

We move all terms to the left:

91-(77+x)=0

We add all the numbers together, and all the variables

-(x+77)+91=0

We get rid of parentheses

-x-77+91=0

We add all the numbers together, and all the variables

-1x+14=0

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

-x=-14

x=-14/-1

x=+14

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