21+c=30

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Solution for 21+c=30 equation: 


Simplifying
21 + c = 30

Solving
21 + c = 30

Solving for variable 'c'.

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

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

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

Combine like terms: 30 + -21 = 9
c = 9

Simplifying
c = 9

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