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=3n+6=69
=3n=69-6
=3n=63
=n=63/3=21
n=21
n+2=21+2=23
n+4=21+4=25
21+25=46 C
3x + 6 = 69
3x = 69-6
3x = 63
x = 63:3 = 21
jadi
21+21= 41 tapi jawabannya nggak ada