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55-x=2x+13
We move all terms to the left:
55-x-(2x+13)=0
We add all the numbers together, and all the variables
-1x-(2x+13)+55=0
We get rid of parentheses
-1x-2x-13+55=0
We add all the numbers together, and all the variables
-3x+42=0
We move all terms containing x to the left, all other terms to the right
-3x=-42
x=-42/-3
x=+14
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