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c in (-oo:+oo)
(4/5)*c-21 = -6 // + 6
(4/5)*c-21+6 = 0
4/5*c-15 = 0 // + 15
4/5*c = 15 // : 4/5
c = 15/4/5
c = 75/4
c = 75/4
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