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//Rozwiąż:
a) 2+(x-4)(x+4)=(x-1)do drugiej potęgi
b) 4x do drugiej -(1-2x)do drugiej +2x=11
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2 + x do 2 - 16 = x do 2 - 2x + 1
x do 2 - x do 2 + 2x = 1 - 2 + 16
2x = 15
x = 15/2
x = 7 1/2
4 xdo 2 - 1 + 4x - 4x do 2 +2x = 11
-1 + 6x = 11
6x = 12
x = 2
x = 7 1/2
x = 2