A+B+80=100

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Solution for A+B+80=100 equation:


Simplifying
A + B + 80 = 100

Reorder the terms:
80 + A + B = 100

Solving
80 + A + B = 100

Solving for variable 'A'.

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

Add '-80' to each side of the equation.
80 + A + -80 + B = 100 + -80

Reorder the terms:
80 + -80 + A + B = 100 + -80

Combine like terms: 80 + -80 = 0
0 + A + B = 100 + -80
A + B = 100 + -80

Combine like terms: 100 + -80 = 20
A + B = 20

Add '-1B' to each side of the equation.
A + B + -1B = 20 + -1B

Combine like terms: B + -1B = 0
A + 0 = 20 + -1B
A = 20 + -1B

Simplifying
A = 20 + -1B

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