Solving for N is an illustration of subject of formula, and the equation of N is N = 1 + (S - A)/D
The equation of S is given as:
S = A+(N-1) D
Subtract A from both sides
S - A = (N-1) D
Divide both sides by D
(S - A)/D = N-1
Add 1 to both sides of the equation
N = 1 + (S - A)/D
Hence, the equation of N is N = 1 + (S - A)/D
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