TP1 <- 5
TP2 <- 10
P1 <- 15
P2 <- 30

FP1 <- 3
FP2 <- 2
N1 <- 12
N2 <- 8

TN1 <- N1 - FP1
TN2 <- N2 - FP2

TPR2 <- TP2/P2
TPR1 <- TP1/P1

FPR2 <- FP2/N2
FPR1 <- FP1/N1

acc2 <- (TP2 + TN2)/(P2+N2)
acc1 <- (TP1 + TN1)/(P1+N1)

TPR2 == TPR1
FPR2 == FPR1
acc2 == acc1

TRUE
TRUE
FALSE