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350(3+x)=3500
We move all terms to the left:
350(3+x)-(3500)=0
We add all the numbers together, and all the variables
350(x+3)-3500=0
We multiply parentheses
350x+1050-3500=0
We add all the numbers together, and all the variables
350x-2450=0
We move all terms containing x to the left, all other terms to the right
350x=2450
x=2450/350
x=7
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