1)у= – 2(х + 8) + х - 120 = -2x - 16 + x - 120 = -x - 28x = -28
2)у= 3(х - 5) - 210 = 3x - 15 - 210 = 3x - 36x = 12
3)у= 5х - 3(х - 15) – 170 = 5x - 3x + 45 - 170 = 2x + 28x = -14
4)у= – 7(х – 9) - х - 40 + 80 = -7x + 63 - x - 320 = -8x + 31x = 31/8
1)
у= – 2(х + 8) + х - 12
0 = -2x - 16 + x - 12
0 = -x - 28
x = -28
2)
у= 3(х - 5) - 21
0 = 3x - 15 - 21
0 = 3x - 36
x = 12
3)
у= 5х - 3(х - 15) – 17
0 = 5x - 3x + 45 - 17
0 = 2x + 28
x = -14
4)
у= – 7(х – 9) - х - 40 + 8
0 = -7x + 63 - x - 32
0 = -8x + 31
x = 31/8