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80x+30*100=70x+70*100
We move all terms to the left:
80x+30*100-(70x+70*100)=0
We add all the numbers together, and all the variables
80x-(70x+7000)+30*100=0
We add all the numbers together, and all the variables
80x-(70x+7000)+3000=0
We get rid of parentheses
80x-70x-7000+3000=0
We add all the numbers together, and all the variables
10x-4000=0
We move all terms containing x to the left, all other terms to the right
10x=4000
x=4000/10
x=400
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