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0.45x+40+20=0.55x+50
We move all terms to the left:
0.45x+40+20-(0.55x+50)=0
We add all the numbers together, and all the variables
0.45x-(0.55x+50)+60=0
We get rid of parentheses
0.45x-0.55x-50+60=0
We add all the numbers together, and all the variables
-0.1x+10=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-10
x=-10/-0.1
x=+100
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