45-25=b

Solution for 45-25=b equation:

Simplifying
45 + -25 = b

Combine like terms: 45 + -25 = 20
20 = b

Solving
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.
20 + -1b = b + -1b

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

Add '-20' to each side of the equation.
20 + -20 + -1b = 0 + -20

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

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

Divide each side by '-1'.
b = 20

Simplifying
b = 20