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w in (-oo:+oo)
(1/4)*(8*w-16) = 2*w-4 // - 2*w-4
(1/4)*(8*w-16)-(2*w)+4 = 0
(1/4)*(8*w-16)-2*w+4 = 0
1/4*(8*w-16)-2*w+4 = 0
1/4*(8*w-16)-2*w+4 = 0
4-4 = 0
0 = 0
0 = 0
0 = 0
w należy do R
w in (-oo:+oo)
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