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a) (x-3)(x+2) + (5-x)(x+1) = 0
b) (2x+1)(x-4) = 2(1-x)(5-x)
e) 2 + (2x-3)(x+1) = 3x - 2(5 - x kwadrat)
f) 4(x+5) - 0,5(x-3)(6-2x) = x kwadrat + 1
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