3(5+a)+4a=

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

Simplifying
3(5 + a) + 4a = 0
(5 * 3 + a * 3) + 4a = 0
(15 + 3a) + 4a = 0

Combine like terms: 3a + 4a = 7a
15 + 7a = 0

Solving
15 + 7a = 0

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + 7a = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 7a = 0 + -15
7a = 0 + -15

Combine like terms: 0 + -15 = -15
7a = -15

Divide each side by '7'.
a = -2.142857143

Simplifying
a = -2.142857143