1)а)-2/3x+2,1=1/4х-1,2б)8(-y-2)=-5y-(6-9y)в)-в-(в/4+3/8)=1/2+(-3в/8-0,5)

А) -2/3x + 2,1 = 1/4х - 1,2

( $\frac{2}{3}$ + $\frac{1}{4}$ ) x = 2,1 +1,2

$\frac{11}{12}$ x = 3,3

x = 3,3 * $\frac{12}{11}$

x = 3,6

б) 8 (-y - 2) = -5y - (6 - 9y)
- 8y - 16 = - 5y - 6 + 9y
12y = -10
y = - $\frac{5}{6}$

в) -b - (b/4 + 3/8) = 1/2 + (-3b/8 - 0,5)
-b - b/4 - 3/8 = 1/2 - 3b/8 - 0,5
(-7/8)b = 3/8
b = -3/7