exam Maths Puzzle Numerical Ability

can someone help me solve this one please?

3/x-1=6/x+2

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exam Other Question

Solve then graph 7x_>28
Of course the _ is supposed to be under the > Would it be a clear, or solid circle when graphing it? Let P, Q, R, S and T be points in space

a.) Find an equivalent vector to QT-ST

b.) Find an equivalent vector to PR + RT + QS + SQ + TP + PT + TR