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3(2100-x)=6x
We move all terms to the left:
3(2100-x)-(6x)=0
We add all the numbers together, and all the variables
3(-1x+2100)-6x=0
We add all the numbers together, and all the variables
-6x+3(-1x+2100)=0
We multiply parentheses
-6x-3x+6300=0
We add all the numbers together, and all the variables
-9x+6300=0
We move all terms containing x to the left, all other terms to the right
-9x=-6300
x=-6300/-9
x=+700
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