21=5-2(x-3)

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Solution for 21=5-2(x-3) equation: 



21=5-2(x-3)

We move all terms to the left:

21-(5-2(x-3))=0



We calculate terms in parentheses: -(5-2(x-3)), so:

5-2(x-3)

determiningTheFunctionDomain
-2(x-3)+5

We multiply parentheses

-2x+6+5

We add all the numbers together, and all the variables

-2x+11

Back to the equation:

-(-2x+11)



We get rid of parentheses

2x-11+21=0

We add all the numbers together, and all the variables

2x+10=0

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

2x=-10

x=-10/2

x=-5

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