21=10a+1

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Solution for 21=10a+1 equation:


Simplifying
21 = 10a + 1

Reorder the terms:
21 = 1 + 10a

Solving
21 = 1 + 10a

Solving for variable 'a'.

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

Add '-10a' to each side of the equation.
21 + -10a = 1 + 10a + -10a

Combine like terms: 10a + -10a = 0
21 + -10a = 1 + 0
21 + -10a = 1

Add '-21' to each side of the equation.
21 + -21 + -10a = 1 + -21

Combine like terms: 21 + -21 = 0
0 + -10a = 1 + -21
-10a = 1 + -21

Combine like terms: 1 + -21 = -20
-10a = -20

Divide each side by '-10'.
a = 2

Simplifying
a = 2

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