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1650=2.22/7.15(15+t)
1650=44/7.15(15+t)
1650=660/7(15+t)
1650=9900/7+660/7t
660/7t=1650-9900/7
660/7t=11550/7-9900/7
660/7t=1650/7
t=1650/7.7/660
t=1650/660
t=55/22
t=5/2