21=5.25+(-2y)

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Solution for 21=5.25+(-2y) equation: 



21=5.25+(-2y)

We move all terms to the left:

21-(5.25+(-2y))=0



We calculate terms in parentheses: -(5.25+(-2y)), so:

5.25+(-2y)

determiningTheFunctionDomain
(-2y)+5.25

We get rid of parentheses

-2y+5.25

Back to the equation:

-(-2y+5.25)



We get rid of parentheses

2y-5.25+21=0

We add all the numbers together, and all the variables

2y+15.75=0

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

2y=-15.75

y=-15.75/2

y=-7+1/1.1428571428571

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