Question

$(х+2,5)/1 \frac{2}{7}=3,5$

Answer 1

$(x + \frac{5}{2} ) \times \frac{2}{7} = \frac{7}{2}$
$\frac{2}{7} x + \frac{5}{7} = \frac{7}{2}$
$4x + 10 = 49$
$4x = 39$
$x = \frac{39}{4}$
$x = 9 \frac{3}{4}$
$x = 9.75$