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x+3x+40=4x+40
We move all terms to the left:
x+3x+40-(4x+40)=0
We add all the numbers together, and all the variables
4x-(4x+40)+40=0
We get rid of parentheses
4x-4x-40+40=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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