а)5x-9= -2x+12
5x + 2x = 12 + 9
7x = 21
x = 3
б)9x-20=3x-8
9x-3x=-8+20
6x = 12
x = 2
а)11x-11=7x+9
11x – 7x = 9 + 11
4x = 20
x = 5
б)5-4x=3-5x
– 4x + 5x = 3 – 5
x = -2
а)5x-9= -2x+12
5x + 2x = 12 + 9
7x = 21
x = 3
б)9x-20=3x-8
9x-3x=-8+20
6x = 12
x = 2
а)11x-11=7x+9
11x – 7x = 9 + 11
4x = 20
x = 5
б)5-4x=3-5x
– 4x + 5x = 3 – 5
x = -2