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x(x-2)=3(x+2)
x^2 - 2x = 3x + 6
x^2 - 5x - 6=0
x^2 + x - 6x - 6 = 0
x(x+1) - 6(x+1) = 0
(x-6)(x+1)=0
x-6=0 lub x+1=0
Odp x=6 lub x=-1