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3n+8=15n+40-4
Use the distributive property to multiply 5 by 3n+8.
3n+8=15n+36
Subtract 4 from 40 to get 36.
3n+8-15n=36
Subtract 15n from both sides.
-12n+8=36
Combine 3n and -15n to get -12n.
-12n=36-8
Subtract 8 from both sides.
-12n=28
Subtract 8 from 36 to get 28.
n=\frac{28}{-12}
Divide both sides by -12.
n=-\frac{7}{3}
Reduce the fraction \frac{28}{-12} to lowest terms by extracting and canceling out 4.