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12.5x+(2000*0.12)=10.5x+(3800*0.1)
We move all terms to the left:
12.5x+(2000*0.12)-(10.5x+(3800*0.1))=0
We add all the numbers together, and all the variables
12.5x-(10.5x+380)+240=0
We get rid of parentheses
12.5x-10.5x-380+240=0
We add all the numbers together, and all the variables
2x-140=0
We move all terms containing x to the left, all other terms to the right
2x=140
x=140/2
x=70
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