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5=20-x
We move all terms to the left:
5-(20-x)=0
We add all the numbers together, and all the variables
-(-1x+20)+5=0
We get rid of parentheses
1x-20+5=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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