Quantitative Aptitude Algebra Linear Equation in 2 Variable

What is the sum of the values of p and q for which the system of equations 2x + 3y = 7; (p + q)x + (2p - q)y = 21 has infinite number of solutions?

1
4
2
5
3
6
4
More than one of the above
5
None of the above

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