A-a+4a-2a=20

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Solution for A-a+4a-2a=20 equation: 


Simplifying
A + -1a + 4a + -2a = 20

Combine like terms: -1a + 4a = 3a
A + 3a + -2a = 20

Combine like terms: 3a + -2a = 1a
A + 1a = 20

Solving
A + 1a = 20

Solving for variable 'A'.

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

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

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

Simplifying
A = 20 + -1a

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