а) 5x-3x-5+2x-4 = 4x-9
2. 10,5x = 2,5×21
10,5x = 52,5
x = 5
3. а) 6x-4x-7+2x-5 = 4x-12 = 4(x-3)
б) 6-2x+2,5x-3 = 3+4,5x
4. 1,5x = 2×6,75
1,5x = 13,5
x = 9
а) 5x-3x-5+2x-4 = 4x-9
2. 10,5x = 2,5×21
10,5x = 52,5
x = 5
3. а) 6x-4x-7+2x-5 = 4x-12 = 4(x-3)
б) 6-2x+2,5x-3 = 3+4,5x
4. 1,5x = 2×6,75
1,5x = 13,5
x = 9