750.в)x-7/4=3x-2/5=
5(x-7)=4(3x-2)
5x-35=12x-8
5x-12x=-8+35
-7x=27
x=-3
г)2(5x-1)=9(6x+4)
10x-2=54x+36
10x-54x=36+2
-44x=38
x=-38/44=-19/22
751.в)4x-3 1/4=3/4x+3 1/2
4x-3/4x=3 1/2+ 3 1/4
4x-0.75x=3.5+3.25
3.25x=6.75
x=6 3/4 : 3 1/4
x=27/13
г)1/7x-2-x+1=1/7x+2/7
1/7x-x-1/7x=2/7+2-1
-x=1 2/7
x=-1 2/7