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x in (-oo:+oo)
v = (4/3)^3.14*r^3 // - (4/3)^3.14*r^3
v-((4/3)^3.14*r^3) = 0
v-(4/3)^3.14*r^3 = 0
x należy do R
x in (-oo:+oo)
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