It is a linear equation in a single variable, i.
i = -27.5
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55 + 82 + 92 + 78 + 100 + 96 + 78 = 581
it would be 91 because if you add 36+55 it would equal 91 :)
-22
Assuming you wish to make this equation equal zero, for x2 + 16x + 55 = 0, x = -5.
8x+7=55 8x=55-7 8x=48 x=48/8 x=6