You wouldnt get any solutions as if you substituted them into each other you would get:
-3x - 6 = -3x + 7
the -3x cancel eachother out so you end up with
-6 = 7 which isnt true
-26/5 is the larger number. It is -5.1.
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The volume would also be the same since the volume of a cone is 1/3bh.
So the volume is six pi cubic inches.