What is the correct answer for 3r - 3p + 5q if p = 4, q = -2, r = 3, and s = -5?

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Gringo123
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p = 4
q = -2
r = 3
s = -5

on that basis, evaluate this expression:

3r - 3p + 5q

I make it to be -7 (15 - 12 + (-10)
But my math book says the answer is -13. Can anyone explain where I have gone wrong?
Thanks
 
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3r - 3p + 5q

= 3(3) - 3(4) + 5(-2)

= 9 - 12 -10

= -13