-15=n/2(2(12)+(n-1)3)

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Solution for -15=n/2(2(12)+(n-1)3) equation: 



-15=n/2(2(12)+(n-1)3)

We move all terms to the left:

-15-(n/2(2(12)+(n-1)3))=0



Domain of the equation: 2(212+(n-1)3))!=0

n∈R



We multiply all the terms by the denominator


-(n-15*2(212+(n-1)3))=0



We calculate terms in parentheses: -(n-15*2(212+(n-1)3)), so:

n-15*2(212+(n-1)3)

Wy multiply elements

n-30n(2

Back to the equation:

-(n-30n(2)

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