Answer
$x= \frac{8}{3}$
Work Step by Step
$3x-4y = 12$
Substitute $y = -1 $ to find $x$
$3x-4(-1) = 12$
$3x+4 = 12$
$3x= 12-4$
$3x = 8$
$x = \frac{8}{3}$
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