21=cd+4ford

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Solution for 21=cd+4ford equation:


Simplifying
21 = cd + 4ford

Solving
21 = cd + 4dfor

Solving for variable 'c'.

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

Add '-1cd' to each side of the equation.
21 + -1cd = cd + -1cd + 4dfor

Combine like terms: cd + -1cd = 0
21 + -1cd = 0 + 4dfor
21 + -1cd = 4dfor

Add '-21' to each side of the equation.
21 + -21 + -1cd = -21 + 4dfor

Combine like terms: 21 + -21 = 0
0 + -1cd = -21 + 4dfor
-1cd = -21 + 4dfor

Divide each side by '-1d'.
c = 21d-1 + -4for

Simplifying
c = 21d-1 + -4for

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