Respuesta :

Answer:

65

Step-by-step explanation:

So let's first set up our equation here:

35 + 42 = 12 + x

Now, let's add like terms

77 = 12 + x

Now, let's subtract both sides by 12

65 = x

Answer:

x=63

Step-by-step explanation:

35+42= 75

75-12= 63

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