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55-2.5x=40-2x
We move all terms to the left:
55-2.5x-(40-2x)=0
We add all the numbers together, and all the variables
-2.5x-(-2x+40)+55=0
We get rid of parentheses
-2.5x+2x-40+55=0
We add all the numbers together, and all the variables
-0.5x+15=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-15
x=-15/-0.5
x=+30
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