5t + 30 - 2t = 42
5t-2t=42-30
3t=12
t=12:3
t=4
проверка
5х4+30-2х4=42
20+30-8=42
42=42
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Answers & Comments
3t=12
t=4
___
5t + 30 - 2t = 42
5t-2t=42-30
3t=12
t=12:3
t=4
проверка
5х4+30-2х4=42
20+30-8=42
42=42