2(x-3)(x+4)=0 |:2
(x-3)(x+4)=0
x-3=0 lub x+4=0
x = 3 x = - 4
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2(x-3)(x+4)=0 |:2
(x-3)(x+4)=0
x-3=0 lub x+4=0
x = 3 x = - 4