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v in (-oo:+oo)
-57 = -v/4 // + -v/4
-(-v/4)-57 = 0
(1/4)*v-57 = 0
1/4*v-57 = 0 // + 57
1/4*v = 57 // : 1/4
v = 57/1/4
v = 228
v = 228
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