Explicación paso a paso:
3x + 3 = 0
3x = -3
x = -3/3
x = -1
comprobación
3.(-1) +3 = 0
-3 +3 = 0
0= 0
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Explicación paso a paso:
3x + 3 = 0
3x = -3
x = -3/3
x = -1
comprobación
3x + 3 = 0
3.(-1) +3 = 0
-3 +3 = 0
0= 0