100=x+20+30+70-20

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



100=x+20+30+70-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(x+100)+100=0

We get rid of parentheses

-x-100+100=0

We add all the numbers together, and all the variables

-x=0

x=0/-1

x=0

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