You can put this solution on YOUR website! 5/4x + 1/8x =3/8 + x
Assuming that's (5/4)x and (1/8)x, not 5/(4x) and 1/(8x):
Multiply everything by 8
10x + x = 3 + 8x
11x = 3+8x
Subtract 8x
3x = 3
x = 1
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I shouldn't have to guess at what you mean. Use parentheses, they're free.