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If 4a^2+b^2+2c^2+4a b-6a c-3b c=0, then ...

If `4a^2+b^2+2c^2+4a b-6a c-3b c=0,` then the family of lines `a x+b y+c=0` may be concurrent at point(s) `(-1,-1/2)` (b) `(-1,-1)` `(-2,-1)` (d) `(-1,2)`

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