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0.35x+0.05(20-x)=0.10(40)
We move all terms to the left:
0.35x+0.05(20-x)-(0.10(40))=0
We add all the numbers together, and all the variables
0.35x+0.05(-1x+20)-(0.104)=0
We add all the numbers together, and all the variables
0.35x+0.05(-1x+20)-0.104=0
We multiply parentheses
0.35x-0.05x+1-0.104=0
We add all the numbers together, and all the variables
0.3x+0.896=0
We move all terms containing x to the left, all other terms to the right
0.3x=-0.896
x=-0.896/0.3
x=-2+0.296/0.3
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