-21+a=30

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Solution for -21+a=30 equation: 


Simplifying
-21 + a = 30

Solving
-21 + a = 30

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + a = 30 + 21

Combine like terms: -21 + 21 = 0
0 + a = 30 + 21
a = 30 + 21

Combine like terms: 30 + 21 = 51
a = 51

Simplifying
a = 51

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