20-7x=21-(5-3x)

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Solution for 20-7x=21-(5-3x) equation: 



20-7x=21-(5-3x)

We move all terms to the left:

20-7x-(21-(5-3x))=0

We add all the numbers together, and all the variables

-7x-(21-(-3x+5))+20=0



We calculate terms in parentheses: -(21-(-3x+5)), so:

21-(-3x+5)

determiningTheFunctionDomain
-(-3x+5)+21

We get rid of parentheses

3x-5+21

We add all the numbers together, and all the variables

3x+16

Back to the equation:

-(3x+16)



We get rid of parentheses

-7x-3x-16+20=0

We add all the numbers together, and all the variables

-10x+4=0

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

-10x=-4

x=-4/-10

x=2/5

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