7=100-3x

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Solution for 7=100-3x equation: 



7=100-3x

We move all terms to the left:

7-(100-3x)=0

We add all the numbers together, and all the variables

-(-3x+100)+7=0

We get rid of parentheses

3x-100+7=0

We add all the numbers together, and all the variables

3x-93=0

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

3x=93

x=93/3

x=31

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