Question

please solve this
please
please
please​

Answer 1

Step-by-step explanation:

-1

-9

10

20

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Answer 2

a) 1+x =0

x=0-1

...x=-1

b)x+9=0

x=0-9

.....x=-9

c) x+(-10)=0

x-10=0

x=0+10

.....x=10

d) -20+x =0

x=0+20

....x=20

HOPE IT HELPS...!