21c+9=15c+3

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Solution for 21c+9=15c+3 equation:


Simplifying
21c + 9 = 15c + 3

Reorder the terms:
9 + 21c = 15c + 3

Reorder the terms:
9 + 21c = 3 + 15c

Solving
9 + 21c = 3 + 15c

Solving for variable 'c'.

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

Add '-15c' to each side of the equation.
9 + 21c + -15c = 3 + 15c + -15c

Combine like terms: 21c + -15c = 6c
9 + 6c = 3 + 15c + -15c

Combine like terms: 15c + -15c = 0
9 + 6c = 3 + 0
9 + 6c = 3

Add '-9' to each side of the equation.
9 + -9 + 6c = 3 + -9

Combine like terms: 9 + -9 = 0
0 + 6c = 3 + -9
6c = 3 + -9

Combine like terms: 3 + -9 = -6
6c = -6

Divide each side by '6'.
c = -1

Simplifying
c = -1

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