Resposta :

 -x=9.(-1)
+x = -9

 -x=-2 .(-1)
+x = +2

-7x=14 .(-1)
+7x = -14
x= -14/7
x= -2 

 -3x=10 .(-1)
+3x = -10
x= -10/3

 -5x=12 .(-1)
+5x = -12
x= -12/5    ou  -2,4

 -4x=8 .(-1)
+4x = -8
x= -8/4
x= -2


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