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10(d+1)=-15
We move all terms to the left:
10(d+1)-(-15)=0
We add all the numbers together, and all the variables
10(d+1)+15=0
We multiply parentheses
10d+10+15=0
We add all the numbers together, and all the variables
10d+25=0
We move all terms containing d to the left, all other terms to the right
10d=-25
d=-25/10
d=-2+1/2
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