(4t-1.5)/0.5-(5t-0.8)/0.2=(1.2-t)/0.1+3
(4t-1.5)/(1/2)-(5t-0.8)/(1/5)=(1.2-t)/(1/10)+3
8t-3-25t+4=12-10t+3
18t-25t=15-1
7t=-14
t=-2