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25+2x=20+x
We move all terms to the left:
25+2x-(20+x)=0
We add all the numbers together, and all the variables
2x-(x+20)+25=0
We get rid of parentheses
2x-x-20+25=0
We add all the numbers together, and all the variables
x+5=0
We move all terms containing x to the left, all other terms to the right
x=-5
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