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a+b+c+d= -2
kurangkan
7a + 3b + c = 0 ..(1)
.
27a+9b+3c+d= 14
-8a+4b-2c+d= -26
.kurangkan
35a + 5b + 5c = 30....(2)
..
27a+9b+3c+d= 14
a+b+c+d= -2
kurangkan
26 a + 8b + 2c = 16....(3)
.
7a + 3b + c = 0 ..(1)
35a + 5b + 5c = 30....(2)
26 a + 8b + 2c = 16....(3)
eliminasikan lagi
35a + 15b + 5c = 0
35a + 5b + 5c = 30
kurangkan
10b = -30
b = -3
.
182a + 78b + 26c = 0
182 a + 56b + 14c = 112
kuranghkan
22b + 12 c = -112
-66 + 12c = -112
c = - 4 2/3
...