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0.07x+0.1(1000-x)=910
We move all terms to the left:
0.07x+0.1(1000-x)-(910)=0
We add all the numbers together, and all the variables
0.07x+0.1(-1x+1000)-910=0
We multiply parentheses
0.07x-0.1x+100-910=0
We add all the numbers together, and all the variables
-0.03x-810=0
We move all terms containing x to the left, all other terms to the right
-0.03x=810
x=810/-0.03
x=-27000
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