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The above output shows that the rank is at least 7, but mwrank has not finished. Each increase in A gives one more independent point (as shown in the output). The size of B is a power of 2, in this case 2^2 so far indicating another 2 in the rank. It is more efficient to increase one of mwrank's parameters (-x in the command line) as that shifts more of the rank into A away from B.

Magma gives the rank as 9 rather more quickly. It uses a different method in this case, the same as that used by E.simon_two_descent() but that does not work here for some reason. The method implemented in mwrank (used by Sage by default) can get slow for elliptic curves with large coefficients since it does some searching and the bounds are large.