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Mechanics 1 Problem [Edexcel]

I was doing June 2014 Q7 part (a) (ii), find it here: http://www.examsolutions.net/a-level-maths-papers/Edexcel/Mechanics/Mechanics-M1/2014-June/paper.php

As in the mark scheme, I obtained the two equations for T by resolving each particle's forces:

T= 4mg - 4mg/7

T= 3mg/7 + 3mg

Next, I equated these equations and found that m=1.

I substituted m=1 into one of them and got T=33.6. But the mark scheme just used one equation without finding the value of m and expressed T as T=33.6m.

Would I be penalized for finding m and expressing T more simply?

EDIT: I just realized I made a fatal error and did not find the value of m correctly. I don't know how to delete posts so please just ignore this.