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y-intercept = 3

y-intercept ; x = 0

7y + 3x - 21 = 0

7y + 3(0) -21 = 0

7y -21 = 0

7y = 21

7y/7 = 21/7

y=3

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Q: What is the y-intercept of 7y 3x-21 equals 0?
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