80=2(30)+b

Solution for 80=2(30)+b equation:

Simplifying
80 = 2(30) + b

Multiply 2 * 30
80 = 60 + b

Solving
80 = 60 + 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.
80 + -1b = 60 + b + -1b

Combine like terms: b + -1b = 0
80 + -1b = 60 + 0
80 + -1b = 60

Add '-80' to each side of the equation.
80 + -80 + -1b = 60 + -80

Combine like terms: 80 + -80 = 0
0 + -1b = 60 + -80
-1b = 60 + -80

Combine like terms: 60 + -80 = -20
-1b = -20

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

Simplifying
b = 20