3=-1(-1)+b

Solution for 3=-1(-1)+b equation:

Simplifying
3 = -1(-1) + b

Multiply -1 * -1
3 = 1 + b

Solving
3 = 1 + 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.
3 + -1b = 1 + b + -1b

Combine like terms: b + -1b = 0
3 + -1b = 1 + 0
3 + -1b = 1

Add '-3' to each side of the equation.
3 + -3 + -1b = 1 + -3

Combine like terms: 3 + -3 = 0
0 + -1b = 1 + -3
-1b = 1 + -3

Combine like terms: 1 + -3 = -2
-1b = -2

Divide each side by '-1'.
b = 2

Simplifying
b = 2