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c in (-oo:+oo)
4*4*c-((7*c)/16)-13 = 0
4*4*c+(-7/16)*c-13 = 0
249/16*c-13 = 0 // + 13
249/16*c = 13 // : 249/16
c = 13/249/16
c = 208/249
c = 208/249
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