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x²-9=x²-6 /+9
x²=x²+3
x*x=x*x+3 /:x
x=x+3
to równanie jest bez właściwego wyniku
x-1<4x² /+1
x<4x²+1
x2-9= (3x-6)(x+3)
x2-9= 3x²+9x-6x-18
2x-9=3x²+3x-18
2x=3x²+3x-9
x= 1,5x²+1,5x-4,5
X-1<4x2
x<9