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5,9,13,17
4,4,4
2a = 4
a=4:2
2
3a+b=5
3.2+b=5
6+b=5
b=5-6
-1
a+b+c=7
2+-1+c=7
1+c=7
c=7-1
6
an²
26²
2.36
72
b.n
-1.6
-6
c=6
72-6+6
72
jadi semoga bermanfaat ....