Ответ:
a = 12.44/0.61
a = 20.393
0.6x*2.9-1.08*2.9=2.958
1.74x = 2.958-3.132
1.74x = -0.174
x = -0.1
Пошаговое объяснение:
1) 3х=х+2
3х-х=2
2х=2
х=1
2)5у+500=2у+2000
5у-2у=2000-500
3у=1500
у=500
3)4х+50=х+500
4х-х=500-50
3х=150
х=50
4)м+х+500=м+2000+3000
м-м+х=5000-500
х=4500