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15=-9/4d
We move all terms to the left:
15-(-9/4d)=0
Domain of the equation: 4d)!=0We get rid of parentheses
d!=0/1
d!=0
d∈R
9/4d+15=0
We multiply all the terms by the denominator
15*4d+9=0
Wy multiply elements
60d+9=0
We move all terms containing d to the left, all other terms to the right
60d=-9
d=-9/60
d=-3/20
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