100+30+80=x

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Solution for 100+30+80=x equation: 



100+30+80=x

We move all terms to the left:

100+30+80-(x)=0

We add all the numbers together, and all the variables

-1x+210=0

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

-x=-210

x=-210/-1

x=+210

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