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0.06x+0.04(61500-x)=2880
We move all terms to the left:
0.06x+0.04(61500-x)-(2880)=0
We add all the numbers together, and all the variables
0.06x+0.04(-1x+61500)-2880=0
We multiply parentheses
0.06x-0.04x+2460-2880=0
We add all the numbers together, and all the variables
0.02x-420=0
We move all terms containing x to the left, all other terms to the right
0.02x=420
x=420/0.02
x=21000
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