X-5=7
X-8=20
X+2=-1
X-9=12
X+-6=-7
X-8=-3
-7-X=-9

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Step-by-step explanation:

x - 5 = 7

x = 12

x - 8 = 20

x = 28

x + 2 = -1

x = -3

x - 9 = 12

x = 21

x + -6 = -7

x = -1

x - 8 = -3

x = 5

-7 - x = -9

-7 = x - 9

2 = x

answer: 12

step-by-step explanation:

because yes