Question

(Solve for n). d+3n=1

Answer 1

Get the variable n on one side of the equation (usually the left-hand side) and everything else on the opposite side of the variable n.

d + 3n = 1
3n = 1 - d <-- Subtract d from each side
n = (1 - d)/3

So, n is equal to (1 - d)/3.