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4x-xkwadrat-3x+3x+xkwadrat=15-12-2
4x=1/:4
x=
b)3xkwadrat-4x-6x+8-1+5x-15+3xkwadrat
3xkwadrat-4x-6x-5x-3xkwadrat=-15-8+1
-15x=-22/:(-15)
x=
x=1