Find the value of the variable for equations having infinitely many solutions

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Calculate the value of \(a\).

The value of \(a\) for the system of equations

8 x + 12 y - 28 = 0

and

(a + 7) x + (4 a - 7) y - (8 a - 7) = 0

having infinitely many solutions are and .

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8. Find the value of the variable for equations having infinitely many solutions