-1=-4(5)+b

Solution for -1=-4(5)+b equation:

Simplifying
-1 = -4(5) + b

Multiply -4 * 5
-1 = -20 + b

Solving
-1 = -20 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
-1 + -1b = -20 + b + -1b

Combine like terms: b + -1b = 0
-1 + -1b = -20 + 0
-1 + -1b = -20

Add '1' to each side of the equation.
-1 + 1 + -1b = -20 + 1

Combine like terms: -1 + 1 = 0
0 + -1b = -20 + 1
-1b = -20 + 1

Combine like terms: -20 + 1 = -19
-1b = -19

Divide each side by '-1'.
b = 19

Simplifying
b = 19