-15+23=-4(x+21)

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Solution for -15+23=-4(x+21) equation: 



-15+23=-4(x+21)

We move all terms to the left:

-15+23-(-4(x+21))=0

We add all the numbers together, and all the variables

-(-4(x+21))+8=0



We calculate terms in parentheses: -(-4(x+21)), so:

-4(x+21)

We multiply parentheses

-4x-84

Back to the equation:

-(-4x-84)



We get rid of parentheses

4x+84+8=0

We add all the numbers together, and all the variables

4x+92=0

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

4x=-92

x=-92/4

x=-23

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