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b)(x-2/3)(2/3+x)=2/3x+x²-4/9-2/3x=x²-4/9
c)(5x+3)²-(4x+3)²>9(x+1)²
25x²+30x+9-(16x²+24x+9)>9(x²+2x+1)
25x²+30x+9-16x²-24x-9>9x²+18x+9
25x²+30x+9-16x²-24x-9-9x²-18x+9>0
-12x+9>0
-4x+3>0
-4x>-3/:(-4)
x<3/4