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40+50x=80+40x
We move all terms to the left:
40+50x-(80+40x)=0
We add all the numbers together, and all the variables
50x-(40x+80)+40=0
We get rid of parentheses
50x-40x-80+40=0
We add all the numbers together, and all the variables
10x-40=0
We move all terms containing x to the left, all other terms to the right
10x=40
x=40/10
x=4
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