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100-5x=20x-25
We move all terms to the left:
100-5x-(20x-25)=0
We get rid of parentheses
-5x-20x+25+100=0
We add all the numbers together, and all the variables
-25x+125=0
We move all terms containing x to the left, all other terms to the right
-25x=-125
x=-125/-25
x=+5
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