-86=-2(3+5a)

Solution for -86=-2(3+5a) equation:

Simplifying
-86 = -2(3 + 5a)
-86 = (3 * -2 + 5a * -2)
-86 = (-6 + -10a)

Solving
-86 = -6 + -10a

Solving for variable 'a'.

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

Add '10a' to each side of the equation.
-86 + 10a = -6 + -10a + 10a

Combine like terms: -10a + 10a = 0
-86 + 10a = -6 + 0
-86 + 10a = -6

Add '86' to each side of the equation.
-86 + 86 + 10a = -6 + 86

Combine like terms: -86 + 86 = 0
0 + 10a = -6 + 86
10a = -6 + 86

Combine like terms: -6 + 86 = 80
10a = 80

Divide each side by '10'.
a = 8

Simplifying
a = 8