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c in (-oo:+oo)
15/7 = 5*c+20 // - 5*c+20
15/7-(5*c)-20 = 0
15/7-5*c-20 = 0
-5*c-125/7 = 0 // + 125/7
-5*c = 125/7 // : -5
c = 125/7/(-5)
c = -25/7
c = -25/7
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