100-0.2x=30

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Solution for 100-0.2x=30 equation: 



100-0.2x=30

We move all terms to the left:

100-0.2x-(30)=0

We add all the numbers together, and all the variables

-0.2x+70=0

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

-0.2x=-70

x=-70/-0.2

x=+350

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