Question

0,4(6-4t)=1,9-0,5(3t-7)

Answer 1

2,4-1,6t=1,9-1,5t+3,5
2,4-1,6t=5,4-1,5t
-1,6t+1,5t=5,4-2,4
-0,1t=3
t=3:(-0,1)
t=-30