(a/2*(a-1))=28

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Solution for (a/2*(a-1))=28 equation: 



(a/2(a-1))=28

We move all terms to the left:

(a/2(a-1))-(28)=0



Domain of the equation: 2(a-1))!=0

a∈R



We multiply all the terms by the denominator


(a-28*2(a-1))=0



We calculate terms in parentheses: +(a-28*2(a-1)), so:

a-28*2(a-1)

Wy multiply elements

a-56a(a

Back to the equation:

+(a-56a(a)

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