100=80-4b

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Solution for 100=80-4b equation:


Simplifying
100 = 80 + -4b

Solving
100 = 80 + -4b

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '4b' to each side of the equation.
100 + 4b = 80 + -4b + 4b

Combine like terms: -4b + 4b = 0
100 + 4b = 80 + 0
100 + 4b = 80

Add '-100' to each side of the equation.
100 + -100 + 4b = 80 + -100

Combine like terms: 100 + -100 = 0
0 + 4b = 80 + -100
4b = 80 + -100

Combine like terms: 80 + -100 = -20
4b = -20

Divide each side by '4'.
b = -5

Simplifying
b = -5

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