80=20-a-a-2a

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Solution for 80=20-a-a-2a equation:


Simplifying
80 = 20 + -1a + -1a + -2a

Combine like terms: -1a + -1a = -2a
80 = 20 + -2a + -2a

Combine like terms: -2a + -2a = -4a
80 = 20 + -4a

Solving
80 = 20 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
80 + 4a = 20 + -4a + 4a

Combine like terms: -4a + 4a = 0
80 + 4a = 20 + 0
80 + 4a = 20

Add '-80' to each side of the equation.
80 + -80 + 4a = 20 + -80

Combine like terms: 80 + -80 = 0
0 + 4a = 20 + -80
4a = 20 + -80

Combine like terms: 20 + -80 = -60
4a = -60

Divide each side by '4'.
a = -15

Simplifying
a = -15

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