100+7x=400-9x

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Solution for 100+7x=400-9x equation: 



100+7x=400-9x

We move all terms to the left:

100+7x-(400-9x)=0

We add all the numbers together, and all the variables

7x-(-9x+400)+100=0

We get rid of parentheses

7x+9x-400+100=0

We add all the numbers together, and all the variables

16x-300=0

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

16x=300

x=300/16

x=18+3/4

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