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0.065(x+2400)-0.075x=138
We move all terms to the left:
0.065(x+2400)-0.075x-(138)=0
We add all the numbers together, and all the variables
-0.075x+0.065(x+2400)-138=0
We multiply parentheses
-0.075x+0.065x+156-138=0
We add all the numbers together, and all the variables
-0.01x+18=0
We move all terms containing x to the left, all other terms to the right
-0.01x=-18
x=-18/-0.01
x=+1800
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