x + x + 20 =180
2x = 180-20
2х=160
x = 80
Ответ:
2х+20=180
2х=180-20
Х=80
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x + x + 20 =180
2x = 180-20
2х=160
x = 80
Ответ:
2х+20=180
2х=180-20
2х=160
Х=80