6-5(2x+8)=14+2x 6-10x-40=14+2x 8x=40+14-6 8x=48 x=6
3(1-x)-(2-x)=2 3-3x-2+x=2 -2x=-3+2+2 -2x=1 x= -1/2
4(x+8)-7(x-1)=12 4x+32-7x+7=12 -3x=-32-7+12 -3x=-27 x=9
0.2-2(x+1)=0.4x 0.2-2x-2=0.4x -1.8=2.4x x=-0.75
4x-5.5=5x-3(2x-1.5) 4x-5x+6x=5.5+4.5 5x=10 x=2
5x^2+1-2x<0
5x^2-2x+1<0
√D1=1-5=-4
⇒ x<0
(5x² + 6x - 3) - (2x² - 3x - 4) = 5x² + 6x - 3 - 2x² + 3x + 4 =3x² + 9x + 1
4х^2 = 25
х^2 = 25/4
х1 = 5/2 и х2 = - 5/2