The age difference between Jerry and Peter is 10.
This involves subtracting two variables from each other when doing calculations in which the minus sign is used.
T = Jy + 3
Jo = P - 2
E = 2T
T = 5 + J
5 + J = Jy + 3
T = P - 2 - 5
= P - 7
P - 7 = Jy + 3
p - Jy = 10
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