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c in (-oo:+oo)
c/2.5 = -4.2 // + 4.2
c/2.5+4.2 = 0
0.4*c+4.2 = 0 // - 4.2
0.4*c = -4.2 // : 0.4
c = -4.2/0.4
c = -10.5
c = -10.5
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