Answer:
Explanation:
Move constant to right hand side and change it's sign
⇒
Add the numbers
⇒
Let's check:
When d = 15 , R.H.S = 15 - 7 = 8
And L.H.S = 8
Thus , R.H.S = L.H.S when d = 15.
Therefore d = 15 is the solution of the equation.
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