1)5(x-4)=x+8; 2)9-7(x+3)=5-6x; 3)0.4(6-4y)=0.5(7-3y)-1.9

Question

1)5(x-4)=x+8; 2)9-7(x+3)=5-6x; 3)0.4(6-4y)=0.5(7-3y)-1.9

Answer 1

1) 5x-20=x+8
5x-x=8+20
4x=28
x=7

Answer 2

1)5x-20=x+8
5x-x=8+20
4x=28
x= 28:4
x=7

2) 9-7x-21=5-6x
7x-6x=5-9+21
x=17

3)2.4-0.4y=3.5-1.5y-1.9
-0.4y+1.5y=3.5-1.9-2.4
1.1y=-0.8
y=-0.8:1.1
y=-0.72