-540=-20(-3b)

Solution for -540=-20(-3b) equation:

Simplifying
-540 = -20(-3b)

Remove parenthesis around (-3b)
-540 = -20 * -3b

Multiply -20 * -3
-540 = 60b

Solving
-540 = 60b

Solving for variable 'b'.

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

Add '-60b' to each side of the equation.
-540 + -60b = 60b + -60b

Combine like terms: 60b + -60b = 0
-540 + -60b = 0

Add '540' to each side of the equation.
-540 + 540 + -60b = 0 + 540

Combine like terms: -540 + 540 = 0
0 + -60b = 0 + 540
-60b = 0 + 540

Combine like terms: 0 + 540 = 540
-60b = 540

Divide each side by '-60'.
b = -9

Simplifying
b = -9