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20+2.50x=9+3.75x
We move all terms to the left:
20+2.50x-(9+3.75x)=0
We add all the numbers together, and all the variables
2.50x-(3.75x+9)+20=0
We get rid of parentheses
2.50x-3.75x-9+20=0
We add all the numbers together, and all the variables
-1.25x+11=0
We move all terms containing x to the left, all other terms to the right
-1.25x=-11
x=-11/-1.25
x=8+1/1.25
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