Question

10(0,4-2х)+13х-3,8=
Если x = $\frac{2}{7}$ то

Answer 1

$10(0.4 - 2x) + 13x - 3.8 = 0.2 - 7x$

$0.2 - 7 \times \frac{2}{7} = - 1.8$

Answer 2

10(0,4-2х)+13х-3,8=0,2-7х=0,2-7х2/7=-1.8