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2) 4/5w-t=5
-t=5-4/5w
t=-5+4/5w
1/2w-3/5(-5+4/5w)=4
1/2w+15/5-12/25w=4
1/2w+3-12/25w=4
1/2w-12/25w=4-3
w/50=1---------------------w=50
t=-5+4/5w
t=-5+4/5(50)
t=-5+40----------------------t=35