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0.06x+0.03(7000-x)=243
We move all terms to the left:
0.06x+0.03(7000-x)-(243)=0
We add all the numbers together, and all the variables
0.06x+0.03(-1x+7000)-243=0
We multiply parentheses
0.06x-0.03x+210-243=0
We add all the numbers together, and all the variables
0.03x-33=0
We move all terms containing x to the left, all other terms to the right
0.03x=33
x=33/0.03
x=1100
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