Respuesta :

1) m-5= -18 (add 5 to both sides)
m= -13

2) m-11= -4 (add 11 to both sides)
m= 7

3) x+10=22 (subtract 10 from both sides)
x= 12

4) n-19= -16 (add 19 to both sides)
n= 3

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