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c in (-oo:+oo)
(-2/3)*c = 8.7 // - 8.7
(-2/3)*c-8.7 = 0
-2/3*c-8.7 = 0 // + 8.7
-2/3*c = 8.7 // : -2/3
c = 8.7/(-2/3)
c = -13.04999993
c = -13.04999993
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