1)x = 2/(-1/7)
x = 2 *(-7)
x = -14
2) x : -1/100 = 38
x * (- 100)= 38
x = 38 / (-100)
x = - 0.38
3)x = -5 + 4
x = -1
4) y = 0.4 - 2.8
y = -2.4
5)y = 3
6)z = (-8-2) * 3
z = -30
7)b = -3.6 - 3.6
b = -7.2
8)m = -38/10 + 9/5(домножим 2ое число на 2)
m = -38/10 + 18/10
m = -20/10
m = -2
9)3x + 6 = -12
3x = -18
x = -6
10)-2y+2 -5 = 4
-2y = 7
y = -3.5
дальше сами..