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200(3+x)=1800
We move all terms to the left:
200(3+x)-(1800)=0
We add all the numbers together, and all the variables
200(x+3)-1800=0
We multiply parentheses
200x+600-1800=0
We add all the numbers together, and all the variables
200x-1200=0
We move all terms containing x to the left, all other terms to the right
200x=1200
x=1200/200
x=6
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