19=a+21

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Solution for 19=a+21 equation:


Simplifying
19 = a + 21

Reorder the terms:
19 = 21 + a

Solving
19 = 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.
19 + -1a = 21 + a + -1a

Combine like terms: a + -1a = 0
19 + -1a = 21 + 0
19 + -1a = 21

Add '-19' to each side of the equation.
19 + -19 + -1a = 21 + -19

Combine like terms: 19 + -19 = 0
0 + -1a = 21 + -19
-1a = 21 + -19

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

Divide each side by '-1'.
a = -2

Simplifying
a = -2

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