The appropriate equation will be 2x + 3x + 4x + 5x = 705
The equation that equals 47 by only using the digits 2,3,4,5 once will be illustrated below:
2x + 3x + 4x + 5x = 705
Finding the value of x will be
15x = 705
Divide
x = 705 / 15
x = 47
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