15=0(20)+b

Solution for 15=0(20)+b equation:

Simplifying
15 = 0(20) + b

Multiply 0 * 20
15 = 0 + b

Anything times zero is zero.
15 = 0 + b
Remove the zero:
15 = b

Solving
15 = 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.
15 + -1b = b + -1b

Combine like terms: b + -1b = 0
15 + -1b = 0

Add '-15' to each side of the equation.
15 + -15 + -1b = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -1b = 0 + -15
-1b = 0 + -15

Combine like terms: 0 + -15 = -15
-1b = -15

Divide each side by '-1'.
b = 15

Simplifying
b = 15