400=100+10x

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Solution for 400=100+10x equation: 



400=100+10x

We move all terms to the left:

400-(100+10x)=0

We add all the numbers together, and all the variables

-(10x+100)+400=0

We get rid of parentheses

-10x-100+400=0

We add all the numbers together, and all the variables

-10x+300=0

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

-10x=-300

x=-300/-10

x=+30

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