Solve the following equations:
Operating C1→C1+C2+C3
Taking (x+a+b+c) common from C1
Operating R1→R1-R3, R2→R2-R3
Expanding with C1
0=(x+a+b+c)(0+x2)
0=x2(x+a+b+c)
Either x2=0 or (x+a+b+c)=0
∴ x=0 or x=-(a+b+c)
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