Odpowiedź :
2x(5x-7)+4x(8-3x)=0
10x²-14x+32x-12x²=0
-2x²+18x=0
x=0 x=9
2x-(5x+(6x-(8x-9)))=-8
2x-5x-6x+8x+1=0
x=1
2x+1-(3x-4)≥3
2x+1-3x+4-3=0
2x-3x+1+4-3=0
x=2
10x²-14x+32x-12x²=0
-2x²+18x=0
x=0 x=9
2x-(5x+(6x-(8x-9)))=-8
2x-5x-6x+8x+1=0
x=1
2x+1-(3x-4)≥3
2x+1-3x+4-3=0
2x-3x+1+4-3=0
x=2