28=21-2c

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Solution for 28=21-2c equation:


Simplifying
28 = 21 + -2c

Solving
28 = 21 + -2c

Solving for variable 'c'.

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

Add '2c' to each side of the equation.
28 + 2c = 21 + -2c + 2c

Combine like terms: -2c + 2c = 0
28 + 2c = 21 + 0
28 + 2c = 21

Add '-28' to each side of the equation.
28 + -28 + 2c = 21 + -28

Combine like terms: 28 + -28 = 0
0 + 2c = 21 + -28
2c = 21 + -28

Combine like terms: 21 + -28 = -7
2c = -7

Divide each side by '2'.
c = -3.5

Simplifying
c = -3.5

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