3(-5a+7)=111

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

Simplifying
3(-5a + 7) = 111

Reorder the terms:
3(7 + -5a) = 111
(7 * 3 + -5a * 3) = 111
(21 + -15a) = 111

Solving
21 + -15a = 111

Solving for variable 'a'.

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

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

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

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

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

Simplifying
a = -6