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40+5x=80+4x
We move all terms to the left:
40+5x-(80+4x)=0
We add all the numbers together, and all the variables
5x-(4x+80)+40=0
We get rid of parentheses
5x-4x-80+40=0
We add all the numbers together, and all the variables
x-40=0
We move all terms containing x to the left, all other terms to the right
x=40
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