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0.30x+0.10(100-x)=11
We move all terms to the left:
0.30x+0.10(100-x)-(11)=0
We add all the numbers together, and all the variables
0.30x+0.10(-1x+100)-11=0
We multiply parentheses
0.30x-0.1x+10-11=0
We add all the numbers together, and all the variables
0.2x-1=0
We move all terms containing x to the left, all other terms to the right
0.2x=1
x=1/0.2
x=5
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