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4x+(-5x)+20=20
We move all terms to the left:
4x+(-5x)+20-(20)=0
We add all the numbers together, and all the variables
4x+(-5x)=0
We get rid of parentheses
4x-5x=0
We add all the numbers together, and all the variables
-x=0
x=0/-1
x=0
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