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5x + 2 - (2x+1) = 2x + 1 - (x +3)
5x + 2 -2x -1 = 2x +1 -x - 3
3x +1 = x -2
2x = -3
x = -3/2
x+3, 2x+1, 5x+2
untuk mencari beda = suku ke3-sukuke2 = suku ke2-suku1
5x+2-(2x+1) = 2x+1 - (x+3)
5x+2-2x-1 = 2x+1 -x-3
5x-2x-2x+x = 1-3-2+1
2x = -3
x = = -1,5
U1= x+3 = -1,5+3 = 1,5
U2 =2(1,5) + 1 = 4
U3=5(1,5)+2 = 9,5