21=1/2(5x+7)

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Solution for 21=1/2(5x+7) equation: 



21=1/2(5x+7)

We move all terms to the left:

21-(1/2(5x+7))=0



Domain of the equation: 2(5x+7))!=0

x∈R



We multiply all the terms by the denominator


-(1+21*2(5x+7))=0



We calculate terms in parentheses: -(1+21*2(5x+7)), so:

1+21*2(5x+7)

determiningTheFunctionDomain
21*2(5x+7)+1

Wy multiply elements

42x(5+1

Back to the equation:

-(42x(5+1)



We add all the numbers together, and all the variables

-(42x6=0

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