3+4c+5c=21

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Solution for 3+4c+5c=21 equation: 


Simplifying
3 + 4c + 5c = 21

Combine like terms: 4c + 5c = 9c
3 + 9c = 21

Solving
3 + 9c = 21

Solving for variable 'c'.

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

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

Combine like terms: 3 + -3 = 0
0 + 9c = 21 + -3
9c = 21 + -3

Combine like terms: 21 + -3 = 18
9c = 18

Divide each side by '9'.
c = 2

Simplifying
c = 2

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