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x+0.2(500-x)=0.16(500)
We move all terms to the left:
x+0.2(500-x)-(0.16(500))=0
We add all the numbers together, and all the variables
x+0.2(-1x+500)-(0.165)=0
We add all the numbers together, and all the variables
x+0.2(-1x+500)-0.165=0
We multiply parentheses
x-0.2x+100-0.165=0
We add all the numbers together, and all the variables
0.8x+99.835=0
We move all terms containing x to the left, all other terms to the right
0.8x=-99.835
x=-99.835/0.8
x=-124+0.63499999999999/0.8
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