3r-3c+21=0

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Solution for 3r-3c+21=0 equation:


Simplifying
3r + -3c + 21 = 0

Reorder the terms:
21 + -3c + 3r = 0

Solving
21 + -3c + 3r = 0

Solving for variable 'c'.

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

Add '-21' to each side of the equation.
21 + -3c + -21 + 3r = 0 + -21

Reorder the terms:
21 + -21 + -3c + 3r = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3c + 3r = 0 + -21
-3c + 3r = 0 + -21

Combine like terms: 0 + -21 = -21
-3c + 3r = -21

Add '-3r' to each side of the equation.
-3c + 3r + -3r = -21 + -3r

Combine like terms: 3r + -3r = 0
-3c + 0 = -21 + -3r
-3c = -21 + -3r

Divide each side by '-3'.
c = 7 + r

Simplifying
c = 7 + r

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