-3(4a-a)-5(6+3a)=

Solution for -3(4a-a)-5(6+3a)= equation:

Simplifying
-3(4a + -1a) + -5(6 + 3a) = 0

Combine like terms: 4a + -1a = 3a
-3(3a) + -5(6 + 3a) = 0

Remove parenthesis around (3a)
-3 * 3a + -5(6 + 3a) = 0

Multiply -3 * 3
-9a + -5(6 + 3a) = 0
-9a + (6 * -5 + 3a * -5) = 0
-9a + (-30 + -15a) = 0

Reorder the terms:
-30 + -9a + -15a = 0

Combine like terms: -9a + -15a = -24a
-30 + -24a = 0

Solving
-30 + -24a = 0

Solving for variable 'a'.

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

Add '30' to each side of the equation.
-30 + 30 + -24a = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -24a = 0 + 30
-24a = 0 + 30

Combine like terms: 0 + 30 = 30
-24a = 30

Divide each side by '-24'.
a = -1.25

Simplifying
a = -1.25