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-3,4 + x = 0,5 * (2,85 - 0,35)
-3,4 + x = 0,5 * 2,5
-3,4 + x = 1,25
x = 1,25 + 3,4
x = 4,65
Do liczby - 3 i 2/5 należy dodać 4,65.