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45-x=55-x+x+x
We move all terms to the left:
45-x-(55-x+x+x)=0
We add all the numbers together, and all the variables
-x-(x+55)+45=0
We add all the numbers together, and all the variables
-1x-(x+55)+45=0
We get rid of parentheses
-1x-x-55+45=0
We add all the numbers together, and all the variables
-2x-10=0
We move all terms containing x to the left, all other terms to the right
-2x=10
x=10/-2
x=-5
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