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X+2 - 2X +1 = 2X-3 - X+2
=> -X +1 = X-5
=> -2X = -6
=> X=3.
ingat! suku2 -suku1 = Beda suatu barisan.
X-5 = bedanya.
beda = 3-5 = (-2)
Suku ke 15 = a+ ((n-1).b)
=2X+1 + ((15-1).(-2))
=7+(-28)
=-21