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59

7 + 6 = 113 ---> 7+6=13 and 7-6=1 so write it 1139 + 1 = 810 ---> 9+1=10 and 9-1=8 so write it 8105 + 3 = 28 ---> 5+3=8 and 5-3=2 so write it 289 + 6 = 315 ---> 9+6=15 and 9-6=3 so write it 315Then process in the same manner,7 + 2 =? ----> 7+2=9 and 7-2=5 so you write it as 59! 59

22+22+28+28=100.

it equals 28

it is 28

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x=-5

25 + 28 + 29 = 82

22

3x + 7 = -4x + 28 implies 7x + 7 = 28

28 + 42 = 70

That equals 28

18 + 10 + 28 + 10 = 66

Commutative property of addition.

28

28

28

get a piece of paper and a pencil and figure it out!

x = 13

28 + N = 68 Subtract 28 from each side: N = 40

7.6429

x = 5

8,444 + 67 + 217 + 28 + 3,496 + 732 = 12,984

2y+26 = 28 2y = 28-26 2y = 2 y = 1

It is an algebraic expression which equals a + 28.