2a-2=a+21

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Solution for 2a-2=a+21 equation:


Simplifying
2a + -2 = a + 21

Reorder the terms:
-2 + 2a = a + 21

Reorder the terms:
-2 + 2a = 21 + a

Solving
-2 + 2a = 21 + a

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.
-2 + 2a + -1a = 21 + a + -1a

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

Combine like terms: a + -1a = 0
-2 + 1a = 21 + 0
-2 + 1a = 21

Add '2' to each side of the equation.
-2 + 2 + 1a = 21 + 2

Combine like terms: -2 + 2 = 0
0 + 1a = 21 + 2
1a = 21 + 2

Combine like terms: 21 + 2 = 23
1a = 23

Divide each side by '1'.
a = 23

Simplifying
a = 23

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