Question

If 5x/3 -4 = 2x/5, then the numerical value of 2x - 7 is

Answer 1

First find x by solving linear equation

$15\times (\frac{5x}{3} -4)=\frac{2x}{5} \times 15$

$25x-60=6x$

$19x=60$

The value of x is $\frac{60}{19}$

Now, put the value into desired polynomial 2x-7

$2\times \frac{60}{19} -7=\frac{120-133}{19} =-\frac{13}{19}$ is the answer.

(b)