(3*5)*7=3*(n*7)

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Solution for (3*5)*7=3*(n*7) equation: 



(3*5)*7=3(n*7)

We move all terms to the left:

(3*5)*7-(3(n*7))=0

We add all the numbers together, and all the variables

-(3(+n*7))+15*7=0

We add all the numbers together, and all the variables

-(3(+n*7))+105=0



We calculate terms in parentheses: -(3(+n*7)), so:

3(+n*7)

We multiply parentheses

21n

Back to the equation:

-(21n)



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

-21n=-105

n=-105/-21

n=+5

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