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P'(2+a,-3+b) dicerminan terhadap y=-x⇒P''(3-b,-2-a)
diketahui hasil bayangannya P'(2b,a) dan bhasil yang kita dapat P"(3-b,-2-a)
maka
2b=3-b
2b+b=3
3b=3
b=1
a=-2-a
a+a=-2
2a=-2
a=-1
makka nilai A+b=1-1=0