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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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Q: What is the x-intercept of 3x plus 4y equals 12?
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