Answer:
d=4
Explanation:
First, you have to move the 7 to the left and only keep the d on the right.
41+7=12d (Remember to change the sign)
48=12d (Add the like terms)
Then you have to find the HCF (Highest Common Factor), which is 12.
At last divide both sides by the HCF (12)
So, d=4