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90+0.80x=200.90x
We move all terms to the left:
90+0.80x-(200.90x)=0
We add all the numbers together, and all the variables
0.80x-(+200.90x)+90=0
We get rid of parentheses
0.80x-200.90x+90=0
We add all the numbers together, and all the variables
-200.1x+90=0
We move all terms containing x to the left, all other terms to the right
-200.1x=-90
x=-90/-200.1
x=9/20.01
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