7[c-12]=21

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Solution for 7[c-12]=21 equation: 


Simplifying
7[c + -12] = 21

Reorder the terms:
7[-12 + c] = 21
[-12 * 7 + c * 7] = 21
[-84 + 7c] = 21

Solving
-84 + 7c = 21

Solving for variable 'c'.

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

Add '84' to each side of the equation.
-84 + 84 + 7c = 21 + 84

Combine like terms: -84 + 84 = 0
0 + 7c = 21 + 84
7c = 21 + 84

Combine like terms: 21 + 84 = 105
7c = 105

Divide each side by '7'.
c = 15

Simplifying
c = 15

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