1) x-49x=02) 7x=(2x+1)+3x-53) (x-2)+(x+2)=2x(x-1)+34) x-3x+2x-6=05)

1) x-49x=0
x(x-49)=0
x(x-7)(x+7)=0
x=0
x-7=0
x=7
x+7=0
x=-7
2) 7x=(2x+1)+3x-5
7x=4x+4x+1+3x-5
7x=7x+4x-4
7x+4x-4-7x=0
4x-4=0
4x=4
x=4:4
x=1
3) (x-2)+(x+2)=2x(x-1)+3
(x-2+x+2)((x-2)-(x-2)(x+2)+(x+2))=2x-2x+3
2x(x-4x+4-x+4+x+4x+4)=2x-2x+3
2x(x+12)=2x-2x+3
2x+24x=2x-2x+3
2x+24x-2x+2x=3
26x=3
x=26/3
4) x-3x+2x-6=0
x(x-3)+2(x-3)=0
(x+2)(x-3)=0
x=3
5) x+2x-9x-18=0
x(x+2)-9(x+2)=0
(x-9)(x+2)=0
(x-3)(x+3)(x+2)=0
x-3=0
x=3
x+3=0
x=-3
x+2=0
x=-2
6) 7-(2x-2)*(4x+1)=2x*(5-4x)
7-(6x-8x+2x-2)=10x-8x
7-(6x-6x-2)=10x-8x
7-6x+6x+2=10x-8x
-6x+6x+9+8x-10x=0
2x-4x+9=0
D=4*4-4*2*9=16-72=-56lt;0 корней нет
7) (5-x)-(3x-2)*(2x+1)=x*(2-5x)
(25-10х+х)-(6х-4x+3x-2)=2x-5x
25-10x+x-6x+x+2=2x-5x
-5x-9x+27=2x-5x
2x+9x=27
11x=27
x=27/11