Question 1022852
2x-8+x+12+x = 104
4x+4 = 104
4x = 100
x = 25 is the small side. 
The medium side: 25+12 = 37
The largest side: 2(25)-8 = 50-8= 42
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Check:
25+37+42 = 104 we have the correct answer.
J