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Add rm and ms together to get rs

rs = 3x + 1 + 4x - 2

rs = 7x - 1

rs = 7x - 1 is your answer

hope this helps
      3x + 1                  4x - 2
|----------------------------|----------------------------|
r                             m                            s

since "m" is the midpoint, thus "m" cuts "rs" in two equal halves, therefore, rm = ms, and thus 3x + 1 = 4x - 2, and surely you'd know what "x" is then.

so rs is just (3x+1) + (4x-2), or just the halves added up.