Question

помогите решить:
$2.3x + 5.4x - 6.7x = \frac{31}{40}$
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Answer 1

$2.3x + 5.4x - 6.7x = \frac{31}{40 } \\ 7.7x - 6.7x = \frac{31}{40} \\ x = \frac{31}{40}$