15+7c-8=21

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Solution for 15+7c-8=21 equation: 



15+7c-8=21

We move all terms to the left:

15+7c-8-(21)=0

We add all the numbers together, and all the variables

7c-14=0

We move all terms containing c to the left, all other terms to the right

7c=14

c=14/7

c=2

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