math homework part 2?

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Solve: (2n - 9)/7 = (3 - n)/4

2007-02-19 08:03:57 · 2 answers · asked by soccerstar11 3 in Education & Reference ➔ Homework Help

(2n - 9)/7 = (3 - n)/4
*7 *4 *7 *4

4(2n - 9) = 7(3 - n)

8n-36 = 21 - 7n
+7n +36 +7n +36

15n = 57
/15 /15

n = 57/15

2007-02-19 08:15:24 · answer #1 · answered by theFo0t 3 · 0⤊ 0⤋

take 28 as your lcd

4(2n-9)=7(3-n)
8n-36=21-7n
8n-36+36=21+36-7n
8n=57-7n
8n+7n=57-7n+7n
15n=57
n=57/15 = 3 12/15=3 4/5

2007-02-19 17:43:47 · answer #2 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋