Question

\(\text{Tìm x, biết:}\)

\(a\)) \(\left(19x+2.5^2\right):14=\left(13-8\right)^2-4^2\)

\(b\)) \(x+\left(x+1\right)+\left(x+2\right)+...+\left(x+30\right)=1240\)

\(c\)) \(11-\left(-53+x\right)=97\)

\(d\)) \(-\left(x+84\right)+213=-16\)