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diperoleh persamaan
(a+b=46)-(a+4b=34)
dengan b = -4
substitusikan
a-4=46
a=50
jadi 50+(24)-4 = -46
U5 = a+4b = 34
------------------------- -
0-3b = 12
b = 12 / -3
b = - 4
*U2 = a+1b = 46
a-14 = 46
a = 46+14
a = 60
U25 = a +(25-1)b
= 60 + 24 . (-4)
= 60 - 96
= -36