3=-1x+b

Solution for 3=-1x+b equation:

Simplifying
3 = -1x + b

Reorder the terms:
3 = b + -1x

Solving
3 = b + -1x

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 = b + -1b + -1x

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

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

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

Divide each side by '-1'.
b = 3 + x

Simplifying
b = 3 + x