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np. x2- x do potęgi drugiej
2x*(x-1)-1/2*(4x²-8)=6x
2x2 - 2x - 2x2 + 4= 6x
-2x+4=6x
-2x-6x= -4
-8x= -4/: ( -8)
x= 1/2
3x-2*(x+7)=5x-9
3x-2x -14=5x-9
x-5x=14-9
-4x=5/: ( -4)
x= - 1 1/4
x*(x+3)-(x+1)*(x-1)=2x+1
x2 + 3x- ( x2- 1)=2x+1
x2+3x-x2+1=2x+1
3x+1=2x+1
3x-2x=1-1
x=0