0.5*n*(n+1)=55

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Solution for 0.5*n*(n+1)=55 equation: 



0.5*n*(n+1)=55

We move all terms to the left:

0.5*n*(n+1)-(55)=0

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

0.5*n*(n+1)=55

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