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0.5(x+200)=0.55x-290
We move all terms to the left:
0.5(x+200)-(0.55x-290)=0
We multiply parentheses
0.5x-(0.55x-290)+100=0
We get rid of parentheses
0.5x-0.55x+290+100=0
We add all the numbers together, and all the variables
-0.05x+390=0
We move all terms containing x to the left, all other terms to the right
-0.05x=-390
x=-390/-0.05
x=+7800
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