c+21=40

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Solution for c+21=40 equation: 


Simplifying
c + 21 = 40

Reorder the terms:
21 + c = 40

Solving
21 + c = 40

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 = 40 + -21

Combine like terms: 21 + -21 = 0
0 + c = 40 + -21
c = 40 + -21

Combine like terms: 40 + -21 = 19
c = 19

Simplifying
c = 19

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