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100+0.80x=40+0.90x
We move all terms to the left:
100+0.80x-(40+0.90x)=0
We add all the numbers together, and all the variables
0.80x-(0.90x+40)+100=0
We get rid of parentheses
0.80x-0.90x-40+100=0
We add all the numbers together, and all the variables
-0.1x+60=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-60
x=-60/-0.1
x=+600
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