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Aya=Aya....Anak= A
Aya-4= 8 (8A-4)
Aya= 8A-32+4
Aya=8A-28+4
Aya= 8A-28...Persamaan I
6 + Aya +6 + A= 56 ...Persamaan II
6 + (8A-28)+6+A=56
9A-16=56
9A= 56+16=72
Anak= 8
AYA= 8 x (8)-28 = 36... Jadi Anak umurAnak= 8...Aya = 36
anak = x
y-4 = 8 (x-4) => y - 4 = 8x - 32 => 28 = 8x - y
6+x + 6+y = 56 => x + y = 44 => y = 44 - x
28 = 8x - 44 + x
72 = 9x
8 thn = x
y = 44 - 8 = 36 thn8 (x-4) = y-4
8x - 32 = y -4
8x - y =28
(x+6)+(y+6) = 56
x+y +12 =56
x+y = 44
8x - y =28
x +y =44
9x =72
x = 8
y = 36
jadi umur anak 8 dan ayah 36