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Here is the original equation, lets solve this step-by-step

(x + 2)/4 = 5

Now, lets find out how. 

We must apply the inverse operation. 

4/2 is the reciprocal, so lets multiply that to both sides. 

4/2 = 2
5*4 = 20

4x + 8 = 20
      -8      -8            Subtract 8 from both sides. (Inverse operation) 

4x = 12
4x/4  = 12/4             Divide 4 by both sides (Inverse)

x = 12/4
x = 3           Simplified

Answer:  x = 3

x + 2 = 5
____
4
~~~~~~~~~~~~~~~~~~~~~~~~ Multiply 4 on both sides:

x + 2 = 5
____
4
x4 x4
----------------
4(x+2) = 4(5) [DONT FORGET TO SIMPLIFY]

4x + 8 = 20
~~~~~~~~~~~~~~~~~~~~~~~~ Subtract 8 from both sides:

4x + 8 = 20
-8 -8
---------------------
4x = 12
~~~~~~~~~~~~~~~~~~~~~~~~
Divide by 4

4x = 12
÷4 ÷4
--------------
x = 3

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