7x=400+3x

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Solution for 7x=400+3x equation: 



7x=400+3x

We move all terms to the left:

7x-(400+3x)=0

We add all the numbers together, and all the variables

7x-(3x+400)=0

We get rid of parentheses

7x-3x-400=0

We add all the numbers together, and all the variables

4x-400=0

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

4x=400

x=400/4

x=100

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