Ответ:
3-5+2х=7
-2+2х=7
2х=9
х=4.5
5+5-х=7
10-х=7
х=3
2х-6-5=6
2х=6+6+5
2х=17
х=8.5
3+(5-2х)=5
3+5-2х=5
-2х=-3
х=2/3
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Ответ:
3-5+2х=7
-2+2х=7
2х=9
х=4.5
5+5-х=7
10-х=7
х=3
2х-6-5=6
2х=6+6+5
2х=17
х=8.5
3+(5-2х)=5
3+5-2х=5
-2х=-3
х=2/3