Resposta :

DANILOCICILIOTTI
X+2 = 4 -X
2X= 2
X = 2/2
X = 1

B)
Y+10-2Y-5 = 0 
-Y +5 = 0
-Y = -5  *(-1)
Y =5
luizinetefernan
a) x + 2 = 4 - x
   x + x = 4 - 2
   2x = 2
     x = 2/2
     x = 1

b) y + 10 - 2y - 5 = 0
    -y + 5 = 0     x(-1)
    y - 5 = 0
   y = 5

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