100-x=80-0.5

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Solution for 100-x=80-0.5 equation: 



100-x=80-0.5

We move all terms to the left:

100-x-(80-0.5)=0

We add all the numbers together, and all the variables

-x+100-(79.5)=0

We add all the numbers together, and all the variables

-1x+20.5=0

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

-x=-20.5

x=-20.5/-1

x=20+0.5/1

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