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umur ayah = x
umur ibu = y
mk :
x = 8+y
x+y = 72
subtitusi nili x :
x+ y = 72
8+y+ y = 72
8 + 2y = 72
2y = 72-8
y = 64/2
y = 32 thun
jd umur ibu = 32 thn