72=7*6+b

Solution for 72=7*6+b equation:

Simplifying
72 = 7 * 6 + b

Multiply 7 * 6
72 = 42 + b

Solving
72 = 42 + 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.
72 + -1b = 42 + b + -1b

Combine like terms: b + -1b = 0
72 + -1b = 42 + 0
72 + -1b = 42

Add '-72' to each side of the equation.
72 + -72 + -1b = 42 + -72

Combine like terms: 72 + -72 = 0
0 + -1b = 42 + -72
-1b = 42 + -72

Combine like terms: 42 + -72 = -30
-1b = -30

Divide each side by '-1'.
b = 30

Simplifying
b = 30