7\ 2+t = 4,2 \ t
7t= 8,4 + 4,2t
7t-4,2t = 8,4
2,8t = 8,4
t=3
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7\ 2+t = 4,2 \ t
7t= 8,4 + 4,2t
7t-4,2t = 8,4
2,8t = 8,4
t=3
2,8t = 8,4
t = 3