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c in (-oo:+oo)
11*c-(((7*c)/6)*c)-((2/6)*c) = 0
(-7/6)*c^2+11*c+(-1/3)*c = 0
32/3*c-7/6*c^2 = 0
DELTA = (32/3)^2-(-7/6*0*4)
DELTA = 1024/9
DELTA > 0
c = ((1024/9)^(1/2)-32/3)/(-7/6*2) or c = (-(1024/9)^(1/2)-32/3)/(-7/6*2)
c = 0 or c = 64/7
c in { 0, 64/7 }
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