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0.40x+280=0.60x+240
We move all terms to the left:
0.40x+280-(0.60x+240)=0
We get rid of parentheses
0.40x-0.60x-240+280=0
We add all the numbers together, and all the variables
-0.2x+40=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-40
x=-40/-0.2
x=+200
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