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0.32x+0.12(50-x)=0.20*50
We move all terms to the left:
0.32x+0.12(50-x)-(0.20*50)=0
We add all the numbers together, and all the variables
0.32x+0.12(-1x+50)-10=0
We multiply parentheses
0.32x-0.12x+6-10=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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