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0.02x+(8000-x)0.03=210
We move all terms to the left:
0.02x+(8000-x)0.03-(210)=0
We add all the numbers together, and all the variables
0.02x+(-1x+8000)0.03-210=0
We multiply parentheses
0.02x-0.03x+240-210=0
We add all the numbers together, and all the variables
-0.01x+30=0
We move all terms containing x to the left, all other terms to the right
-0.01x=-30
x=-30/-0.01
x=+3000
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