81=1+sX4

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Solution for 81=1+sX4 equation: 



81=1+ss4

We move all terms to the left:

81-(1+ss4)=0

We add all the numbers together, and all the variables

-(ss4+1)+81=0

We get rid of parentheses

-ss4-1+81=0

We add all the numbers together, and all the variables

-ss4+80=0

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

-ss4=-80

s=-80/1

s=-80

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