28=7+8+c

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Solution for 28=7+8+c equation:


Simplifying
28 = 7 + 8 + c

Combine like terms: 7 + 8 = 15
28 = 15 + c

Solving
28 = 15 + c

Solving for variable 'c'.

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

Add '-1c' to each side of the equation.
28 + -1c = 15 + c + -1c

Combine like terms: c + -1c = 0
28 + -1c = 15 + 0
28 + -1c = 15

Add '-28' to each side of the equation.
28 + -28 + -1c = 15 + -28

Combine like terms: 28 + -28 = 0
0 + -1c = 15 + -28
-1c = 15 + -28

Combine like terms: 15 + -28 = -13
-1c = -13

Divide each side by '-1'.
c = 13

Simplifying
c = 13

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