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-5(-11d+20)=20+20d+20
We move all terms to the left:
-5(-11d+20)-(20+20d+20)=0
We add all the numbers together, and all the variables
-5(-11d+20)-(20d+40)=0
We multiply parentheses
55d-(20d+40)-100=0
We get rid of parentheses
55d-20d-40-100=0
We add all the numbers together, and all the variables
35d-140=0
We move all terms containing d to the left, all other terms to the right
35d=140
d=140/35
d=4
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