Ответ:

1)(x-2)-49=0

(x-2-7)*(x-2+7)=0

(x-9)x(x+5)=0

x-9=0

x+5=0

x=9

x=-5

=-5,=9

2) 9(2x+3)-25=0

(3(2x+3)-5)*(3(2x+3)+5)=0

(6x+9-5)*(6x+9+5)=0

(6x+4)*(6x+14)=0

2(3x+2)*2(3x+7)=0

(3x+2)*(3x+7)=0

3x+2=03x+7=0

x=-2/3

x=-7/3

=-7/3,=-2/3

3) 2(3x+5)=7(3x+5)

2(9+30x+25)=21x+35

18+60x+50=21x+35

18+60x+50-21x-35=0

18+39x+15=0

6+13x+5=0

6+10x+3x+5=0

2*(3x+5)+3x+5=0

3(x+5)*(2x+1)=0

3x+5=0

2x+1=0

x=-5/3

x=-1/2

=-5/3,=-1/2

4) (3x-1)=4-12x

9-6x+1=4-12x

9-6x+1-4+12x=0

9+6x-3=0

3+2x-1=0

3+3x-x-1=0

3x*(x+1)*(3x-1=0

x+1=0

3x-1=0

x=-1

x=1/3

=-1,=1/3