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5n+7n=216
12n=216
n=18
A=90
B=126
Maka:
A= 5x
B= 7x
A + B= 216
5x + 7x= 216
12x= 216
x= 216/12
x= 18
maka, nila A dan B adalah :
A= 5x
= 5(18)
= 90
B= 7x
= 7(18)
= 126