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0.1(20+x)=3
We move all terms to the left:
0.1(20+x)-(3)=0
We add all the numbers together, and all the variables
0.1(x+20)-3=0
We multiply parentheses
0.1x+2-3=0
We add all the numbers together, and all the variables
0.1x-1=0
We move all terms containing x to the left, all other terms to the right
0.1x=1
x=1/0.1
x=10
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