Question

решите уравнение. 2.8-(7.8-x)=6. 0.2(x-5)-0.7(x+6)=2.8

Answer 1

2.8-7.8+х=6
5+х=6
Х=6-5
Х=1

0.2х-1-0.7х-4.2=2.8
0.5х-5.2=2.8
0.5х=2.8+5.2
0.5х=8
Х=8:0.5
Х=16