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0.7x+0.35(35-x)=0.6*35
We move all terms to the left:
0.7x+0.35(35-x)-(0.6*35)=0
We add all the numbers together, and all the variables
0.7x+0.35(-1x+35)-21=0
We multiply parentheses
0.7x-0.35x+12.25-21=0
We add all the numbers together, and all the variables
0.35x-8.75=0
We move all terms containing x to the left, all other terms to the right
0.35x=8.75
x=8.75/0.35
x=25
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