Respuesta :

Let:

x = The number we want to find

(3 + x)*4 = 36

Solving for x:

Divide both sides by 4:

((3 + x)*4)/4 = 36/4

3 + x = 9

Subtract 3 from both sides:

3 + x - 3 = 9 - 3

x = 6

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