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R (5) = 5a + b = - 5
R (8) = 8a + b = 7
-------------------- -
- 3a = - 12
a = -12/-3
a = 4
5a + b = - 5
5 .5 + b = - 5
25 + b = - 5
b = - 5 - 25
b = - 30
R (x) = 5x - 30
(p) = 5p - 30
19 = 5p - 30
5p = 19 + 30
5p = 49
p = 49/5
p = 9 4/5