-4(3+x)=9
– 12 – 4x = 9
– 4x = 9 + 12
-4x = 21
x = -5.25
3(2-5x)=8x
6 – 15x = 8x
– 15x – 8x = – 6
-23x = -6
x = -6/-23
х=0,26086956521
5(8+2x)=10-4x
40 + 10x = 10 – 4x
10x + 4x = 10 – 40
14x = -30
7x = -15
x = -15/7
х=-2,14285714286
-4(3+x)=9
– 12 – 4x = 9
– 4x = 9 + 12
-4x = 21
x = -5.25
3(2-5x)=8x
6 – 15x = 8x
– 15x – 8x = – 6
-23x = -6
x = -6/-23
х=0,26086956521
5(8+2x)=10-4x
40 + 10x = 10 – 4x
10x + 4x = 10 – 40
14x = -30
7x = -15
x = -15/7
х=-2,14285714286