Question

помогите с 3,и 4 заданием

Answer 1

3) 3-(2x-9)=(16+2x)-3(x-3)
3-2x+9=16+2x-3x+3
-2x-2x+3x=16+3-3-9
-1x=7
x=-7

4) -4(2y-0.9)-2.4=6.4-10y
-8y+3.6-2.4=6.4-10y
-8y-10y=6.4-3.6+2.4
-18y=5.2
y=5.2/-18
y=13/45