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The graphs of the equations 3x + y- 5 = ...

The graphs of the equations 3x + y- 5 = 0 and 2x - y - 5 = 0 intersect at the point `P(alpha,beta)` . What is the value of `(3 alpha+ beta)`?

A

`-4`

B

3

C

5

D

4

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