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81=18x+40+23x
We move all terms to the left:
81-(18x+40+23x)=0
We add all the numbers together, and all the variables
-(41x+40)+81=0
We get rid of parentheses
-41x-40+81=0
We add all the numbers together, and all the variables
-41x+41=0
We move all terms containing x to the left, all other terms to the right
-41x=-41
x=-41/-41
x=1
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