Answer :

you do 
4 x X = 4x
4 x 3 = 12
13 = 4x + 12
then solve 
SuperLegend
13=4(x+3)
Use distributive property
13=4x+12
Subtract 12 from both sides
1=4x
Divide 4 on both sides
Final Answer: 1/4 = x

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