31=21-3c

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Solution for 31=21-3c equation:


Simplifying
31 = 21 + -3c

Solving
31 = 21 + -3c

Solving for variable 'c'.

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

Add '3c' to each side of the equation.
31 + 3c = 21 + -3c + 3c

Combine like terms: -3c + 3c = 0
31 + 3c = 21 + 0
31 + 3c = 21

Add '-31' to each side of the equation.
31 + -31 + 3c = 21 + -31

Combine like terms: 31 + -31 = 0
0 + 3c = 21 + -31
3c = 21 + -31

Combine like terms: 21 + -31 = -10
3c = -10

Divide each side by '3'.
c = -3.333333333

Simplifying
c = -3.333333333

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