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20+7x=25+2x
We move all terms to the left:
20+7x-(25+2x)=0
We add all the numbers together, and all the variables
7x-(2x+25)+20=0
We get rid of parentheses
7x-2x-25+20=0
We add all the numbers together, and all the variables
5x-5=0
We move all terms containing x to the left, all other terms to the right
5x=5
x=5/5
x=1
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