\(\left(19x+2.5^1\right):14=\left(13-8\right)^2-4^2.\)
\(\left(19x+10\right):14=5^2-4^2\)
\(\left(19x:4\right)+\left(10:4\right)=25-16\)
\(\left(19x:4\right)+\frac{5}{2}=9\)
\(19x:4=9-\frac{5}{2}\)
\(19x:4=\frac{13}{2}\)
\(19x=\frac{13}{2}.4=26\)
\(x=\frac{26}{19}\)
B/ \(-\left(x+84\right)+213=\left(-16\right).\)
\(-x-84+213=-16\)
\(-x+129=-16\)
\(-x=\left(-145\right)\)
\(\Rightarrow x=145\)