4,2x - x = 5,12
3,5x + x = 9,9
2,136: (1,9 - x) = 7,12
5,9x + 2,3x = 27,88
8,7x - 4,5x = 10,5
помогите пж

1) 4,2х-х=5,123,2х=5,12х=1,62) 3,5х+х=9,94,5х=9,9х=2,23) 2,136:(1,9-х)=7,121,9-х=0.3х=1,64) 5,9х+2,3х=27,888,2х=27.88х=3,45) 8,7х-4,5х=10,54,2х=10,5х=2,5