2/7 · (1,4t - 3 1/2b) - 1,2 · (5/6t - 0,5b) =
= 2/7 · 1,4t - 2/7 · 7/2b - 1,2 · 5/6t + 1,2 · 0,5b =
= 0,4t - b - t + 0,6b = (0,4t - t) + (0,6b - b) =
= - 0,6t - 0,4b.
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2/7 · (1,4t - 3 1/2b) - 1,2 · (5/6t - 0,5b) =
= 2/7 · 1,4t - 2/7 · 7/2b - 1,2 · 5/6t + 1,2 · 0,5b =
= 0,4t - b - t + 0,6b = (0,4t - t) + (0,6b - b) =
= - 0,6t - 0,4b.