Find the value of k , if the line 2x+3y+4+k(6x-y+12)=0 is perpendicular to the line 7x+5y-4=0.

Given, the first line is,

Comparing the above equation with the equation of line y = m1x + c, so,

The second line is,

Comparing the above equation with the equation of line y = m1x + c, so,

First line is perpendicular to the other line. Therefore,

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