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550=x+1.2x
We move all terms to the left:
550-(x+1.2x)=0
We add all the numbers together, and all the variables
-(+2.2x)+550=0
We get rid of parentheses
-2.2x+550=0
We move all terms containing x to the left, all other terms to the right
-2.2x=-550
x=-550/-2.2
x=249+1/1
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