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x²-9-(4x²-4x+1)=6x-3x²-9
4x-10=6x-9
-2x=1 /:(-2)
x=-1/2
b) 3(x+2)²+(2x-1)²-7(x+3)(x-3)=28
3(x²+4x+4)+(4x²-4x+1)-(x²+9)=28
3x²+12x+12+4x-4x+1-7x²-63=28
8x=28+63-12-1
8x=28+50
8x=78 /:8
x=9,75