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f(3) = 40
-5(3)+B = 40
-15 + B =40
B = 55
f(-2)=P
P=-5(-2) + 55
P= 10 + 55
P= 65
f(0)=Q
Q=-5(0)+55
Q=0+ 55
Q= 55
f(R)=7
-5R+55=7
-5R=-48
R=48/5 = 9,6