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0,0025x=0,025 / * 10000
25x=250 / : 25
x=100
b) 8x+28+3x^2+12x-12x-16=(3x+2)(3x+2)
8x+28+9x^2-16= 9x^2+6x+6x+4
8x+9x^2-9x^2-6x-6x=4-28+16
8x-12x=-8
-4x=-8x / : (-4)
x=2
c) x-x=1-1/4
0=3/4
d, e...to są ułamki czy dzielenie?