Resposta :

savanna
a)19=-19x
19x= - 19
x= -19/19
x= -1

b)-16=-4x
4x=16
x=16/4
x=4

c) x/4=12
x=12*4
x=48
eluciamonteiro
a)19=-19x
+19x = -19
x= -19/19
x= -1

b)-16=-4x
4x = 16
x= 16/4
x= 4

x/4 = 12     
x= 12 .4
x= 48

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