10+11=9+a

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Solution for 10+11=9+a equation:


Simplifying
10 + 11 = 9 + a

Combine like terms: 10 + 11 = 21
21 = 9 + a

Solving
21 = 9 + 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.
21 + -1a = 9 + a + -1a

Combine like terms: a + -1a = 0
21 + -1a = 9 + 0
21 + -1a = 9

Add '-21' to each side of the equation.
21 + -21 + -1a = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -1a = 9 + -21
-1a = 9 + -21

Combine like terms: 9 + -21 = -12
-1a = -12

Divide each side by '-1'.
a = 12

Simplifying
a = 12

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