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9t - 15 = 5t - 5
9t - 5t = 15 -5
4t = 10
t = 2,5
9t-15=5t-5
9t=5t-5+15
9t=5t+10
5t+10=9t
10=9t-5t
10=4t
4t=10
t=10/4
t=2,5