100 x 1.4 = 140 (psychic)
180(solar beam)
That should answer your question about sheer power, and if you are soloing a raid you dont have much time to dodge anyway.
About being possible, I have no idea. I have 4 2200+ CP eggys, 3 with C and 1 with ZH, and a few of them bellow 1800. I will try to solo a machamp as soon as one appear, and my team will be the 4 eggys + a WA/FB zard and a ZH/PB espeon because I have nothing better to use. I honestly think that 6 C/SoB lvl 30+ eggys can tank the machamp during the entire raid, but the sheer power of 2 kazam/espeon would be required to not time out.
Can Exeggutors solo raid Machamp?
Living in a grass biome I have been blessed with many good Exeggutors with psychic quick moves. Since Solar Beam has always been the charge move of choice I'm sure most of us that have spent dust on an offensive Exeggutor have that move. I guess the question is can a squad of level 30 psychic attack/Solar Beam Exeggutors solo a Machamp? I also wonder if the sheer power of Solar Beam makes up for the SE damage if you were running a Psychic charge move Exeggutor.
Answers
Dragonites 34.5, Exeggutor 37.5, Alakazham 30. Dragonites lasted the longest and did the most damage but Exeggutor did pretty well too. Alakazham died very fast because I missed a dodge on Dynamic Punch. I think 3 Exeggutors with E/P or C/P have a good shot at taking down Machamp but you'll have to dodge the charge moves.