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Steps:

y - 7y + 6 = 30

-6y + 6 = 30

-6y + 6 - 6 = 30 - 6

-6y = 24

-6y / -6 = 24 / -6

y = -4

Check work:

-4 - 7(-4) + 6 = 30

-4 - (-28) + 6 = 30

-4 + 28 + 6 = 30

24 + 6 = 30

30 = 30

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12y ago

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