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v in (-oo:+oo)
-27 = -v/9 // + -v/9
-(-v/9)-27 = 0
(1/9)*v-27 = 0
1/9*v-27 = 0 // + 27
1/9*v = 27 // : 1/9
v = 27/1/9
v = 243
v = 243
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