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f(1)=2(1)+5=2+5=7
f(3)=2(3)+5=6+5=11
f(5)=2(5)+5=10+5=15
f(7)=2(7)+5=14+5=19
pasangan berurutan:
{(1,7),(3,11),(5,15),(7,19)}
maaf kalau ada yg salah