210=x-0.3x

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Solution for 210=x-0.3x equation: 



210=x-0.3x

We move all terms to the left:

210-(x-0.3x)=0

We add all the numbers together, and all the variables

-(+0.7x)+210=0

We get rid of parentheses

-0.7x+210=0

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

-0.7x=-210

x=-210/-0.7

x=+300

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