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450=70+25d
We move all terms to the left:
450-(70+25d)=0
We add all the numbers together, and all the variables
-(25d+70)+450=0
We get rid of parentheses
-25d-70+450=0
We add all the numbers together, and all the variables
-25d+380=0
We move all terms containing d to the left, all other terms to the right
-25d=-380
d=-380/-25
d=15+1/5
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