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c in (-oo:+oo)
45 = (9/5)*c // - (9/5)*c
45-((9/5)*c) = 0
(-9/5)*c+45 = 0
45-9/5*c = 0 // - 45
-9/5*c = -45 // : -9/5
c = -45/(-9/5)
c = 25
c = 25
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