Question

solve a=nr+4t for t

Answer 1

\[t=\frac{1}{4} (a-n r) \]

Answer 2

a = nr + 4t (subtract nr from both sides)
a - nr = 4t (now divide by 4)
(a - nr)/4 = t

Answer 3

both answers are the same

Answer 4

Using @kelliegirl33's method almost allows one to solve for t by eyeball.
Move 4t to the LHS and then divide each side by 4.