a ) \(\left(19x+2,5^2\right)\div14=\left(13-8\right)^2-4^2\)
\(\Rightarrow\left(19x+50\right)\div14=5^2-16\)
\(\Rightarrow\left(19+50\right)\div14=25-16=9\)
\(\Rightarrow19x+50=9\times14\)
\(\Rightarrow19x+50=126\)
\(\Rightarrow19x=126-50\)
\(\Rightarrow19x=76\)
\(\Rightarrow x=4\)
b ) \(1440\div\left[41-\left(2x-5\right)\right]=2^4.3\)
\(\Leftrightarrow1440\div\left[41-\left(2x-5\right)\right]=48\)
\(\Leftrightarrow41-\left(2x-5\right)=30\)
\(\Leftrightarrow2x-5=11\)
\(\Leftrightarrow2x=16\)
\(\Leftrightarrow x=8\)
