4=0*3+b

Solution for 4=0*3+b equation:

Simplifying
4 = 0 * 3 + b

Multiply 0 * 3
4 = 0 + b

Anything times zero is zero.
4 = 0 + b
Remove the zero:
4 = b

Solving
4 = 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.
4 + -1b = b + -1b

Combine like terms: b + -1b = 0
4 + -1b = 0

Add '-4' to each side of the equation.
4 + -4 + -1b = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1b = 0 + -4
-1b = 0 + -4

Combine like terms: 0 + -4 = -4
-1b = -4

Divide each side by '-1'.
b = 4

Simplifying
b = 4