56=21+21+2(x+3)

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Solution for 56=21+21+2(x+3) equation: 



56=21+21+2(x+3)

We move all terms to the left:

56-(21+21+2(x+3))=0



We calculate terms in parentheses: -(21+21+2(x+3)), so:

21+21+2(x+3)

determiningTheFunctionDomain
2(x+3)+21+21

We add all the numbers together, and all the variables

2(x+3)+42

We multiply parentheses

2x+6+42

We add all the numbers together, and all the variables

2x+48

Back to the equation:

-(2x+48)



We get rid of parentheses

-2x-48+56=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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