9=-2(c+-4)+-1

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Solution for 9=-2(c+-4)+-1 equation: 



9=-2(c+-4)+-1

We move all terms to the left:

9-(-2(c+-4)+-1)=0

We add all the numbers together, and all the variables

-(-2(c-4)+-1)+9=0

We use the square of the difference formula

-(-2(c-4)-1)+9=0



We calculate terms in parentheses: -(-2(c-4)-1), so:

-2(c-4)-1

We multiply parentheses

-2c+8-1

We add all the numbers together, and all the variables

-2c+7

Back to the equation:

-(-2c+7)



We get rid of parentheses

2c-7+9=0

We add all the numbers together, and all the variables

2c+2=0

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

2c=-2

c=-2/2

c=-1

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