100+3x=400

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Solution for 100+3x=400 equation: 



100+3x=400

We move all terms to the left:

100+3x-(400)=0

We add all the numbers together, and all the variables

3x-300=0

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

3x=300

x=300/3

x=100

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