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C in (-oo:+oo)
-25 = (9/5)*C // - (9/5)*C
-((9/5)*C)-25 = 0
(-9/5)*C-25 = 0
-9/5*C-25 = 0 // + 25
-9/5*C = 25 // : -9/5
C = 25/(-9/5)
C = -125/9
C = -125/9
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