Ответ:
6y - 2y + 25 = 65
4у = 65-25
4у = 40
у = 40/4
у = 10
21t - 4t - 17 = 17
17t = 17+17
17t = 34
t = 34/17
t = 2
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6y-2y=65-25
4y=40
y=40:4
y=10
21t-4t-17=17
21t-4t=17+17
17y=34
y=34:17
y=2
Ответ:
6y - 2y + 25 = 65
4у = 65-25
4у = 40
у = 40/4
у = 10
21t - 4t - 17 = 17
17t = 17+17
17t = 34
t = 34/17
t = 2