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20-(10-4x)=20+10+4x
We move all terms to the left:
20-(10-4x)-(20+10+4x)=0
We add all the numbers together, and all the variables
-(-4x+10)-(4x+30)+20=0
We get rid of parentheses
4x-4x-10-30+20=0
We add all the numbers together, and all the variables
-20!=0
There is no solution for this equation
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