2a-1=20

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Solution for 2a-1=20 equation: 


Simplifying
2a + -1 = 20

Reorder the terms:
-1 + 2a = 20

Solving
-1 + 2a = 20

Solving for variable 'a'.

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

Add '1' to each side of the equation.
-1 + 1 + 2a = 20 + 1

Combine like terms: -1 + 1 = 0
0 + 2a = 20 + 1
2a = 20 + 1

Combine like terms: 20 + 1 = 21
2a = 21

Divide each side by '2'.
a = 10.5

Simplifying
a = 10.5

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