21=15-2(x+1)

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Solution for 21=15-2(x+1) equation: 



21=15-2(x+1)

We move all terms to the left:

21-(15-2(x+1))=0



We calculate terms in parentheses: -(15-2(x+1)), so:

15-2(x+1)

determiningTheFunctionDomain
-2(x+1)+15

We multiply parentheses

-2x-2+15

We add all the numbers together, and all the variables

-2x+13

Back to the equation:

-(-2x+13)



We get rid of parentheses

2x-13+21=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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