a=2x-y+(20-1)*(x+y)

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Solution for a=2x-y+(20-1)*(x+y) equation: 


Simplifying
a = 2x + -1y + (20 + -1)(x + y)

Combine like terms: 20 + -1 = 19
a = 2x + -1y + (19)(x + y)
a = 2x + -1y + (x * 19 + y * 19)
a = 2x + -1y + (19x + 19y)

Reorder the terms:
a = 2x + 19x + -1y + 19y

Combine like terms: 2x + 19x = 21x
a = 21x + -1y + 19y

Combine like terms: -1y + 19y = 18y
a = 21x + 18y

Solving
a = 21x + 18y

Solving for variable 'a'.

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

Simplifying
a = 21x + 18y

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