Ответ:

Пошаговое объяснение:

1)x+5/7 =(-3/8) *1  1/3;

x+5/7 =-3/8 * 4/3;

x+5/7 =-1/2;

x=-1/2-5/7;

x=-7/14 -10/14;

x=-17/14=-1 3/14.

2)  y-7/12 = 3 1/2 * (-4/7);

y-7/12 = -7/2 * 4/7;

y-7/12 =  -2;

y=-2+7/12;

y= -1 12/12 + 7/12;

y=-1 5/12.

3)  (-6 2/3)*(-1 1/5) + x = -0.5;

20/3*6/5 +x=-0.5;

8+x=-0.5;

x= -0.5-8;

x=-8.5.

4)  (-5/14)*21/25 -y=3 3/4;

-0.3-y= 3 3/4;

-y=3.75+0.3;

y= -4,05.