Please if I multiply both sides of your firsyt equation, I get:

6x - 8y =26,

now I add side by side your second equation with the above equation so , I get:

11 x = 44

then x = 4

and substituting into your first original equation, I get:

12 - 4y = 13

so

4y= -1

and

y = -1/4

your solution is:

(4, -1/4)

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