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19-9x=40+x
We move all terms to the left:
19-9x-(40+x)=0
We add all the numbers together, and all the variables
-9x-(x+40)+19=0
We get rid of parentheses
-9x-x-40+19=0
We add all the numbers together, and all the variables
-10x-21=0
We move all terms containing x to the left, all other terms to the right
-10x=21
x=21/-10
x=-2+1/10
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