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0=20+25d
We move all terms to the left:
0-(20+25d)=0
We add all the numbers together, and all the variables
-(25d+20)+0=0
We add all the numbers together, and all the variables
-(25d+20)=0
We get rid of parentheses
-25d-20=0
We move all terms containing d to the left, all other terms to the right
-25d=20
d=20/-25
d=-4/5
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