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x^2+2x-x^2+2x,1-1
4x<0
x<0
b) 9x^2+6x+1<=8x-(4-9x^2)
9x^2+6x+1<=8x-4+9x^2
9x^2 ulega redukcji
6x-8x<=-4-1
-2x<=-5
x>=5/2
c) x^2+2x+1-5x+10>=x^2-13
x^2 się redukuje
-3x>=-13-10-1
-3x>=-24
x<=8
d) 4x^2-4x+1-1+5(3-4)<4x^2
-4x-5<0
-4x<5
x>-5/4
x>-1 1/4
e) 4(x^2-6x+9)-7>4x^2+4x+1
4x^2-24x+36-7>4x^2+4x+1
-24x-4x>1+7-36
-28x>-28
x<1
f) 3-(4x^2-25)<=1-(4x^2-12x+9)
3-4x^2+25<=1-4x^2+12x-9
28<=12x-8
-12x<=-8-28
-12x<=-36
x>=3