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0.80x+0.05(10-x)=0.10(20)
We move all terms to the left:
0.80x+0.05(10-x)-(0.10(20))=0
We add all the numbers together, and all the variables
0.80x+0.05(-1x+10)-(0.102)=0
We add all the numbers together, and all the variables
0.80x+0.05(-1x+10)-0.102=0
We multiply parentheses
0.80x-0.05x+0.5-0.102=0
We add all the numbers together, and all the variables
0.75x+0.398=0
We move all terms containing x to the left, all other terms to the right
0.75x=-0.398
x=-0.398/0.75
x=-0.398/0.75
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