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x = (0.39-10.2)/(-3.9961*2)
-12 = -((2/7)*s)-7
x = (0.39-103.5^(1/2))/(-3.9961*2)
x/8-15 = 122
3.9*10^-3 = ((2*x)^2)/((79-x)*(21-x))
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