Ответ:
2.3
10х+7=8х-9
10х-8х=-9-7
2х=-16
Х=-8
20-3х=2х-45
-3х-2х=-45-20
-5х=-65
Х=13
2,7+1,9х=2х+1,5
1,9х-2х=1,5-2,7
-0,1х=-1,2
Х= 12
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Ответ:
2.3
10х+7=8х-9
10х-8х=-9-7
2х=-16
Х=-8
20-3х=2х-45
-3х-2х=-45-20
-5х=-65
Х=13
2,7+1,9х=2х+1,5
1,9х-2х=1,5-2,7
-0,1х=-1,2
Х= 12