300+5x=400

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Solution for 300+5x=400 equation: 



300+5x=400

We move all terms to the left:

300+5x-(400)=0

We add all the numbers together, and all the variables

5x-100=0

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

5x=100

x=100/5

x=20

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