300=100-20x

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Solution for 300=100-20x equation: 



300=100-20x

We move all terms to the left:

300-(100-20x)=0

We add all the numbers together, and all the variables

-(-20x+100)+300=0

We get rid of parentheses

20x-100+300=0

We add all the numbers together, and all the variables

20x+200=0

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

20x=-200

x=-200/20

x=-10

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