300=30+10x+20x

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Solution for 300=30+10x+20x equation: 



300=30+10x+20x

We move all terms to the left:

300-(30+10x+20x)=0

We add all the numbers together, and all the variables

-(30x+30)+300=0

We get rid of parentheses

-30x-30+300=0

We add all the numbers together, and all the variables

-30x+270=0

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

-30x=-270

x=-270/-30

x=+9

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