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-15=x/2.2
We move all terms to the left:
-15-(x/2.2)=0
We add all the numbers together, and all the variables
-(+x/2.2)-15=0
We get rid of parentheses
-x/2.2-15=0
We multiply all the terms by the denominator
-x-15*2.2=0
We add all the numbers together, and all the variables
-1x-33=0
We move all terms containing x to the left, all other terms to the right
-x=33
x=33/-1
x=-33
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