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1680=2400+15x/2
We move all terms to the left:
1680-(2400+15x/2)=0
We add all the numbers together, and all the variables
-(15x/2+2400)+1680=0
We get rid of parentheses
-15x/2-2400+1680=0
We multiply all the terms by the denominator
-15x-2400*2+1680*2=0
We add all the numbers together, and all the variables
-15x-1440=0
We move all terms containing x to the left, all other terms to the right
-15x=1440
x=1440/-15
x=-96
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