10-2(-х-7)=9
10 + 2x + 14 = 9
2x = 9 – 14 – 10
2x = -15
x = -7.5
10+9(-10-9х)=8-х
10 – 90 – 81x = 8 – x
– 81x + x = 8 + 90 – 10
-80x = 88
x = -1.1
10-2(-х-7)=9
10 + 2x + 14 = 9
2x = 9 – 14 – 10
2x = -15
x = -7.5
10+9(-10-9х)=8-х
10 – 90 – 81x = 8 – x
– 81x + x = 8 + 90 – 10
-80x = 88
x = -1.1