100=x+30+70-20

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Solution for 100=x+30+70-20 equation: 



100=x+30+70-20

We move all terms to the left:

100-(x+30+70-20)=0

We add all the numbers together, and all the variables

-(x+80)+100=0

We get rid of parentheses

-x-80+100=0

We add all the numbers together, and all the variables

-1x+20=0

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

-x=-20

x=-20/-1

x=+20

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