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0.12x+0.02(1000000-x)=50000
We move all terms to the left:
0.12x+0.02(1000000-x)-(50000)=0
We add all the numbers together, and all the variables
0.12x+0.02(-1x+1000000)-50000=0
We multiply parentheses
0.12x-0.02x+20000-50000=0
We add all the numbers together, and all the variables
0.1x-30000=0
We move all terms containing x to the left, all other terms to the right
0.1x=30000
x=30000/0.1
x=300000
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