No 14,16,17 tlng kak dikerjain please besok dikumpulin

16

8x -20 +7 = 6x +8 -9
= 8x-6x=8-9+20-7
= 2x=12
x= 6

jawaban ku sih itu. tapi kayakny salah deb

14.
( (9 x 300000) + (15 x 300000) ) – (7 x 300000) + (21 x 300000) )
= (2700000 + 4500000) – (2100000 + 6300000)
= 7200000 – 8400000
= -1200000 cm
= -12 km

selisihnya berarti 12 km ( a )

16.

4(2x-5) +7=2(3x+4)-9
8x-20+7 =6x+8-9
8x-13 =6x-1
8x-6x =13-1
2x =12
x =a = 12:2=6

3a-2= 3(6)-2=18-2=16 C

17.

4x + 20 = x + 2
4x -x = 2 – 20
3x = -18
x = -18 : 3
x = -6

jawaban c