Question

find the value of X: 2/7x + 3 - x = 15​

Answer 1

Question :

find the value of X: 2/7x + 3 - x = 15

Solution :

$\sf \small \longmapsto \frac{2}{7} x + 3 - x = 15$

We have to arrange the terms on the L.H.S. of the equation

$\sf \small \longmapsto \frac{2}{7}x - x + 3 = 15$

Transposing 3 on the right hand side we get

$\sf \small \longmapsto \frac{2 x- 7x}{7} = 15 - 3$

$\sf \small \longmapsto - \frac{5x}{7} = 12$

By cross multiplication we find

$\sf \small \longmapsto - 5x = 12 \times 7$

$\sf \small \longmapsto - 5x = 84$

$\sf \small \longmapsto x = - \frac{84}{5}$

$\sf \small \dashrightarrow x = - 16.80$

So the value is -16.80