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c in (-oo:+oo)
8 = 15-c/3 // - 15-c/3
8-(-c/3)-15 = 0
(1/3)*c-15+8 = 0
1/3*c-7 = 0 // + 7
1/3*c = 7 // : 1/3
c = 7/1/3
c = 21
c = 21
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