-12+2c+3(1-4c)=21

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Solution for -12+2c+3(1-4c)=21 equation: 



-12+2c+3(1-4c)=21

We move all terms to the left:

-12+2c+3(1-4c)-(21)=0

We add all the numbers together, and all the variables

2c+3(-4c+1)-12-21=0

We add all the numbers together, and all the variables

2c+3(-4c+1)-33=0

We multiply parentheses

2c-12c+3-33=0

We add all the numbers together, and all the variables

-10c-30=0

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

-10c=30

c=30/-10

c=-3

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