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1600-(x*3)=100
We move all terms to the left:
1600-(x*3)-(100)=0
We add all the numbers together, and all the variables
-(+x*3)+1600-100=0
We add all the numbers together, and all the variables
-(+x*3)+1500=0
We get rid of parentheses
-x*3+1500=0
Wy multiply elements
-3x+1500=0
We move all terms containing x to the left, all other terms to the right
-3x=-1500
x=-1500/-3
x=+500
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