When working with mixed numbers, it is usually easier to convert them to improper fractions, do the operations, and then to convert any resulting improper fraction back to a mixed number:
5 3/8 + 7 5/6 = (5×8+3)/8 + (7×6+5)/6
= 43/8 + 47/6
= (43×3)/(8×3) + (47×4)/(6×4)
= 129/24 + 188/24
= 317/24
= (13×24+5)/24
= 13 5/24
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3+6+5+7+(9-7)=23
-3 + -7 + 5 + -4 + -6 = -15
9 + 8 + 7 + 6 + 5 + 4 + 3 = 42
6+2/4*3/3-7+6+5/3-1*1 6+1/2*1-7+6+5/3-1 6+1/2-7+6+5/3-1 =37/6 or 61/6
Thirty-five is the LCM of 3/5 + 6/7.