16.8
6.8 + 30 - 20 =
6.8 + 10 =
= 16.8
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v = -1
v=5
(v + 2)(v^2 - 2v + 4)
v -3v + 2 = 0Combine like terms on the left side:-2v + 2 = 0Add 2v to each side:2 = 2vDivide each side by 2:1 = v
v is -15... -15*2 = -30... -30+11= -19.