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2x+8.9(100-x)=2.9
We move all terms to the left:
2x+8.9(100-x)-(2.9)=0
We add all the numbers together, and all the variables
2x+8.9(-1x+100)-(2.9)=0
We add all the numbers together, and all the variables
2x+8.9(-1x+100)-2.9=0
We multiply parentheses
2x-8.9x+890-2.9=0
We add all the numbers together, and all the variables
-6.9x+887.1=0
We move all terms containing x to the left, all other terms to the right
-6.9x=-887.1
x=-887.1/-6.9
x=128+1/1.76923076923
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