3x-100=400-2x

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Solution for 3x-100=400-2x equation: 



3x-100=400-2x

We move all terms to the left:

3x-100-(400-2x)=0

We add all the numbers together, and all the variables

3x-(-2x+400)-100=0

We get rid of parentheses

3x+2x-400-100=0

We add all the numbers together, and all the variables

5x-500=0

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

5x=500

x=500/5

x=100

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