15n - 20 - 12 = 13
15n - 32 = 13
15n = 13 + 32
15n = 45
n = ?
Add 12 to both sides:
Divide across by 5:
3n - 4 = 5
Add 4 to both sides:
(you fill this in)
Finally, divide across by 3:
(you fill this in too!)
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