Just by inspection it looks like 4. Let's check.
3X + 4Y = 12
4Y = -3X + 12
Y = -3/4X + 3
0 out the Y
-3/4X + 3 = 0
-3/4X = -3
X = 4
-------------is the X intercept
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2x-12
3x+8 = 12 3x = 4 x = 4/3
3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
Point slope equation: Y=3X+12
7x = 3x - 12 4x=-12 x=-3