8th grade
posted by
Olivia on
.
I need help on this equation:
5(3n+4)12=13

8th grade 
Ms. Sue,
5(3n+4)12=13
15n  20  12 = 13
15n  32 = 13
15n = 13 + 32
15n = 45
n = ?

8th grade 
jim,
5(3n+4)12=13
Add 12 to both sides:
5(3n+4)=25
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!)