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-20x+100=5x+25
We move all terms to the left:
-20x+100-(5x+25)=0
We get rid of parentheses
-20x-5x-25+100=0
We add all the numbers together, and all the variables
-25x+75=0
We move all terms containing x to the left, all other terms to the right
-25x=-75
x=-75/-25
x=+3
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