u = 7 + 2 + (4 - 5) = 9 + (-1) = 8
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2/5+7/9 is the same as 18/45+35/45 = 53/45
1+2+3+4+5+6+7+8+9= 45 :)
4 + (-2) + 5 = 7 BECAUSE adding a negative number is the same as subtracting the number, so 4 + (-2) = 2 and 2 + 5 = 7
45
52