So, the equation would be 6*3x=36 First, divide by 6 on both sides! Then you get 3x=6 Divide by 3 to isolate x, and you get x=2 X represents the missing side, so the missing side equals two!
To check your answer, plug 2 back in for x! 6*3*2=36 6*6=36 36=36 So that means your answer is right! I hope this helps!