2x=16
x= 16:2
x=8
5x=210+12x
5x-12x=210
- 7x=210
x= 210 :( -7)
x = - 30
17-3x+7x=31- 2x + 10
- 3x+7x+2x= 31+10 - 17
6x = 24
x=24: 6
x =4
6 1/8 - 2 3/8 = 49/8 - 19/8 = 30/8 = 15/4 = 3 3/4 = 3,75
А) -27x +5x = -220
-22x = -220
x = 10
б) 7a - 3a = -310
4a = -310
a = -77,5
в) -2x - 5x = -19 - 16
-7x = -35
x = 5
г) -3b +5b = 9 - 25
2b = -16
b = -8
д) 11y - y = 203 - 3
10y = 200
y = 20