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27) 3 (-5) (-7)

When there is no math symbol between numbers it is multiplication.

Multiply from left to right:

3 * -5 = -15

-15 * -7 = 105

28) -2 * 2 (-3) *2 =

-2 *2 = -4

-4 * -3 = 12

12*2 = 24

31) A negative divided by a negative is positive:

-128 / -4 = 32

32 -36 / 2 / 24 /4

Divide the top and bottom first then divide those:

-36 / 2 = -18

24 / 4 = 6

-18 / 6 = -3

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