105=21+a

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Solution for 105=21+a equation:


Simplifying
105 = 21 + a

Solving
105 = 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.
105 + -1a = 21 + a + -1a

Combine like terms: a + -1a = 0
105 + -1a = 21 + 0
105 + -1a = 21

Add '-105' to each side of the equation.
105 + -105 + -1a = 21 + -105

Combine like terms: 105 + -105 = 0
0 + -1a = 21 + -105
-1a = 21 + -105

Combine like terms: 21 + -105 = -84
-1a = -84

Divide each side by '-1'.
a = 84

Simplifying
a = 84

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