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0.25x+0.20(100-x)=23
We move all terms to the left:
0.25x+0.20(100-x)-(23)=0
We add all the numbers together, and all the variables
0.25x+0.20(-1x+100)-23=0
We multiply parentheses
0.25x-0.2x+20-23=0
We add all the numbers together, and all the variables
0.05x-3=0
We move all terms containing x to the left, all other terms to the right
0.05x=3
x=3/0.05
x=60
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