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0x+5x-20=21x+4
We move all terms to the left:
0x+5x-20-(21x+4)=0
We add all the numbers together, and all the variables
6x-(21x+4)-20=0
We get rid of parentheses
6x-21x-4-20=0
We add all the numbers together, and all the variables
-15x-24=0
We move all terms containing x to the left, all other terms to the right
-15x=24
x=24/-15
x=-1+3/5
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