Question

ayuda¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ urge 20 puntos 60(t+25)=90t

Answer 1

60(t+25)=90t
60t + 1,500 = 90t 
60t - 90t  = -1,500
-30t = -1,500
t = $\frac{-1,500}{-30}$
t = 50

Y si la compruebas...  

60 (50+25) = 90 (50)
4,500 =