To isolate the variable "p" in the equation, we can first multiply both sides of the equation by 4 to get rid of the fraction:
4 * (r + p) / 4 = 4 * s
r + p = 4s
Next, we can subtract "r" from both sides of the equation to isolate the variable "p":
r + p - r = 4s - r
p = 4s - r
Therefore, the variable "p" is equal to 4s - r in the given equation.
(r + p) / 4 = s
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