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100+20x=80+25x
We move all terms to the left:
100+20x-(80+25x)=0
We add all the numbers together, and all the variables
20x-(25x+80)+100=0
We get rid of parentheses
20x-25x-80+100=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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