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0.60x+0.40(100-x)=50
We move all terms to the left:
0.60x+0.40(100-x)-(50)=0
We add all the numbers together, and all the variables
0.60x+0.40(-1x+100)-50=0
We multiply parentheses
0.60x-0.4x+40-50=0
We add all the numbers together, and all the variables
0.2x-10=0
We move all terms containing x to the left, all other terms to the right
0.2x=10
x=10/0.2
x=50
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