13=9-c

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Solution for 13=9-c equation:


Simplifying
13 = 9 + -1c

Solving
13 = 9 + -1c

Solving for variable 'c'.

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

Add 'c' to each side of the equation.
13 + c = 9 + -1c + c

Combine like terms: -1c + c = 0
13 + c = 9 + 0
13 + c = 9

Add '-13' to each side of the equation.
13 + -13 + c = 9 + -13

Combine like terms: 13 + -13 = 0
0 + c = 9 + -13
c = 9 + -13

Combine like terms: 9 + -13 = -4
c = -4

Simplifying
c = -4

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