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

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

Simplifying
-3(4a + -5b) + -1(a + b) = 0
(4a * -3 + -5b * -3) + -1(a + b) = 0
(-12a + 15b) + -1(a + b) = 0
-12a + 15b + (a * -1 + b * -1) = 0
-12a + 15b + (-1a + -1b) = 0

Reorder the terms:
-12a + -1a + 15b + -1b = 0

Combine like terms: -12a + -1a = -13a
-13a + 15b + -1b = 0

Combine like terms: 15b + -1b = 14b
-13a + 14b = 0

Solving
-13a + 14b = 0

Solving for variable 'a'.

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

Add '-14b' to each side of the equation.
-13a + 14b + -14b = 0 + -14b

Combine like terms: 14b + -14b = 0
-13a + 0 = 0 + -14b
-13a = 0 + -14b
Remove the zero:
-13a = -14b

Divide each side by '-13'.
a = 1.076923077b

Simplifying
a = 1.076923077b