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40=4+5d
We move all terms to the left:
40-(4+5d)=0
We add all the numbers together, and all the variables
-(5d+4)+40=0
We get rid of parentheses
-5d-4+40=0
We add all the numbers together, and all the variables
-5d+36=0
We move all terms containing d to the left, all other terms to the right
-5d=-36
d=-36/-5
d=7+1/5
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