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I was able to figure it out with the following code: Clear[x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19, x20, x21, x22, x23]; equation1 = 634.14 x1 + 97.54 x10 - 216.48 x11 - 486.49...
Thank you so much for the assistance. I'm brand new to Mathematica, so I didn't even notice I had equation 13 in there twice, in my system1 statement.