\(\Leftrightarrow x-\dfrac{1}{3}=\dfrac{4}{5}--0,75=\dfrac{31}{20}\\ \Leftrightarrow x=\dfrac{31}{20}+\dfrac{1}{3}=\dfrac{113}{60}\)

<=> 2/5 - x + 4/3 = 3/10

<=> 2/5 - x = 3/10 - 4/3 = -31/30

<=> x = 2/5 - -31/30 = 43/30

"The air pollution here is so great."

==> great??? .-.