Question

solve it and explain question no. 12

Answer 1

here is your answer

Answer 2

$\frac{x-4}{7} -x= \frac{5-x}{3}+1$
$\frac{x-4-7x}{7}= \frac{5-x+3}{3}$
$3(x-4-7x)=7(5-x+3)$
$3x-12-21x=35-7x+21$
$(3-21+7)x=12+35+21$
$x= \frac{-68}{11}$