Упр 405
Помогите пожалуйста

a)

(14x+8):20 = 900 - 894

(14x + 8) : 20 = 6

14x + 8 = 6 * 20

14x + 8 = 120

14x = 120 - 8

14x = 112

x = 112 : 14

x = 8

б)

500:(3y-7)=120-95

500 : (3y - 7 ) = 25

3y - 7 = 500 : 25

3y - 7 = 20

3y = 20 + 7

3y = 27

y = 27 : 3

y = 9

а)900-(14х+8):20=894

(14х+8):20=900-894

(14х+8):20=6

(14х+8)=6*20

14х+8=120

14х=120-8

14х=112

х=112:14

х=8

-----------------------------

900-(14*8+8):20=894

900-120:20=894

900-6=894

894=894

б) 500:(3у-7)+95=120

500:(3у-7)=120-95

500:(3у-7)=25

3у-7=500:25

3у-7=20

3у=20+7

3у=27

у=27:3

у=9

---------------------------

500:(3*9-7)+95=120

500:20+95=120

25+95=120

120=120