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Mathematics 9 Online
OpenStudy (anonymous):

From 4a + 7b - 12c subtract 8a - 9b + 12d. I need help .

OpenStudy (eli_moses):

-4a+16b-24c

OpenStudy (anonymous):

im missing 3 spaces, my answer was -4a+16b-24c-24d but i received partial credit

OpenStudy (eli_moses):

-4a+16b-12c+12d

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