-111=3(-7+5a)

Solution for -111=3(-7+5a) equation:

Simplifying
-111 = 3(-7 + 5a)
-111 = (-7 * 3 + 5a * 3)
-111 = (-21 + 15a)

Solving
-111 = -21 + 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 = -21 + 15a + -15a

Combine like terms: 15a + -15a = 0
-111 + -15a = -21 + 0
-111 + -15a = -21

Add '111' to each side of the equation.
-111 + 111 + -15a = -21 + 111

Combine like terms: -111 + 111 = 0
0 + -15a = -21 + 111
-15a = -21 + 111

Combine like terms: -21 + 111 = 90
-15a = 90

Divide each side by '-15'.
a = -6

Simplifying
a = -6