3^x-3=5^x²-7x+12................
3x-9=5x²-35x+60......................
5x²-35x+60-3x+9......................
5x²-38x+69........,,,,,............,,.,,,
D=b²-4ac=-38²-4*5*69=1444-1380=64=√64=8.................
X12=-b-√D/2a=38+(-) 8/10 = 4.6;3 вроде так