-2 = -27a + 9b - 3c
-6 = -8a + 4b -2c
0 = 12a - 4b + c

should then look like this:
n = xa +/- xb +/- xc

oh and a=-5/6

any ideas? im lost completely and any help would be appreciated UG
Unless there is something about this you learn past Algebra 1 (which I am sure there is) it doesn't seem possible knowing on variable. Though I could do it if B or C wasn't there.
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