3+c=12

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Solution for 3+c=12 equation: 


Simplifying
3 + c = 12

Solving
3 + c = 12

Solving for variable 'c'.

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

Add '-3' to each side of the equation.
3 + -3 + c = 12 + -3

Combine like terms: 3 + -3 = 0
0 + c = 12 + -3
c = 12 + -3

Combine like terms: 12 + -3 = 9
c = 9

Simplifying
c = 9

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