4n+5n+3(n+4)=

Solution for 4n+5n+3(n+4)= equation:

Simplifying
4n + 5n + 3(n + 4) = 0

Reorder the terms:
4n + 5n + 3(4 + n) = 0
4n + 5n + (4 * 3 + n * 3) = 0
4n + 5n + (12 + 3n) = 0

Reorder the terms:
12 + 4n + 5n + 3n = 0

Combine like terms: 4n + 5n = 9n
12 + 9n + 3n = 0

Combine like terms: 9n + 3n = 12n
12 + 12n = 0

Solving
12 + 12n = 0

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-12' to each side of the equation.
12 + -12 + 12n = 0 + -12

Combine like terms: 12 + -12 = 0
0 + 12n = 0 + -12
12n = 0 + -12

Combine like terms: 0 + -12 = -12
12n = -12

Divide each side by '12'.
n = -1

Simplifying
n = -1