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a²+2ab+b²=a²-2ab+b²+4ab
2ab=2ab
0=0
2x+(x-2)(x+2)=2(x-1)²-(x-3)²
2x+x²-4=x²+5
2x=9
x=4.5 jedno roz.
2x-6- 5x+4=1- 2/3x
-9x²-6x=3x-2
-9x²+2=9x
2=9x+9x² wiele roz.
c+2-3=4+2c+30
c-1=34+2c
-1=34+c
-1-c=34
c=-33 jedno roz.