Question

5t+30-12t=42 решить уравнение плиз плиз плиз

Answer 1

5t+30-12t=42

-7t=42-30

-7t=12

t=12:(-7)

t=-1 5/7                               

5*(-1 5/7)+30-12*(-1 5/7)=42

       -5*12/7+30+12*12/7=42

              -60/7+30+144/7=42

                                    42=42

Ответ: -1 5/7.