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5(1-2d)=-15
We move all terms to the left:
5(1-2d)-(-15)=0
We add all the numbers together, and all the variables
5(-2d+1)-(-15)=0
We add all the numbers together, and all the variables
5(-2d+1)+15=0
We multiply parentheses
-10d+5+15=0
We add all the numbers together, and all the variables
-10d+20=0
We move all terms containing d to the left, all other terms to the right
-10d=-20
d=-20/-10
d=+2
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