70=100-x

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Solution for 70=100-x equation: 



70=100-x

We move all terms to the left:

70-(100-x)=0

We add all the numbers together, and all the variables

-(-1x+100)+70=0

We get rid of parentheses

1x-100+70=0

We add all the numbers together, and all the variables

x-30=0

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

x=30

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