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