If line PQ bisects with Line ST at R. SR = 3x +3 and ST = 30 Find x

I come up with x being 9 to equal 15 but the choice for answers are:
What am I doing wrong?

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  1. since R is the midpoint of ST, SR is 1/2 ST, so

    2(3x+3) = 30
    3x+3 = 15
    3x = 12
    x = 4

    not sure what you mean by

    x being 9 to equal 15

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  2. PQ⎯⎯⎯⎯⎯ bisects ST⎯⎯⎯⎯⎯ at R. SR=3x+3 and ST=30. Find x.

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