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a in (-oo:+oo)
(1/2)*(4*a-6) = 2*(a-1.5) // - 2*(a-1.5)
(1/2)*(4*a-6)-(2*(a-1.5)) = 0
(1/2)*(4*a-6)-2*(a-1.5) = 0
1/2*(4*a-6)-2*(a-1.5) = 0
1/2*(4*a-6)-2*(a-1.5) = 0
0 = 0
0 = 0
0 = 0
a należy do R
a in (-oo:+oo)
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