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s in (-oo:+oo)
(1/2)*(-16*s-20) = -8*s-10 // + -8*s-10
(1/2)*(-16*s-20)-(-8*s)+10 = 0
(1/2)*(-16*s-20)+8*s+10 = 0
1/2*(-16*s-20)+8*s+10 = 0
1/2*(-16*s-20)+8*s+10 = 0
10-10 = 0
0 = 0
0 = 0
0 = 0
s należy do R
s in (-oo:+oo)
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