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0.40x+0.20(100-x)=24
We move all terms to the left:
0.40x+0.20(100-x)-(24)=0
We add all the numbers together, and all the variables
0.40x+0.20(-1x+100)-24=0
We multiply parentheses
0.40x-0.2x+20-24=0
We add all the numbers together, and all the variables
0.2x-4=0
We move all terms containing x to the left, all other terms to the right
0.2x=4
x=4/0.2
x=20
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