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c in (-oo:+oo)
2/15 = c/75 // - c/75
2/15-(c/75) = 0
2/15-1/75*c = 0 // - 2/15
-1/75*c = -2/15 // : -1/75
c = -2/15/(-1/75)
c = 10
c = 10
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