4.2(15+5x)=(-20x)-21-x

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Solution for 4.2(15+5x)=(-20x)-21-x equation: 



4.2(15+5x)=(-20x)-21-x

We move all terms to the left:

4.2(15+5x)-((-20x)-21-x)=0

We add all the numbers together, and all the variables

4.2(5x+15)-((-20x)-21-x)=0

We multiply parentheses

21x-((-20x)-21-x)+63=0



We calculate terms in parentheses: -((-20x)-21-x), so:

(-20x)-21-x

determiningTheFunctionDomain
(-20x)-x-21

We add all the numbers together, and all the variables

-1x+(-20x)-21

We get rid of parentheses

-1x-20x-21

We add all the numbers together, and all the variables

-21x-21

Back to the equation:

-(-21x-21)



We get rid of parentheses

21x+21x+21+63=0

We add all the numbers together, and all the variables

42x+84=0

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

42x=-84

x=-84/42

x=-2

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