-111=-6(1-2.5a)

Solution for -111=-6(1-2.5a) equation:

Simplifying
-111 = -6(1 + -2.5a)
-111 = (1 * -6 + -2.5a * -6)
-111 = (-6 + 15a)

Solving
-111 = -6 + 15a

Solving for variable 'a'.

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

Add '-15a' to each side of the equation.
-111 + -15a = -6 + 15a + -15a

Combine like terms: 15a + -15a = 0
-111 + -15a = -6 + 0
-111 + -15a = -6

Add '111' to each side of the equation.
-111 + 111 + -15a = -6 + 111

Combine like terms: -111 + 111 = 0
0 + -15a = -6 + 111
-15a = -6 + 111

Combine like terms: -6 + 111 = 105
-15a = 105

Divide each side by '-15'.
a = -7

Simplifying
a = -7