Tìm x , biết:

a)

\(x - 10 = - 4\)

\(x = - 4 + 10\)

\(x = 6\)

Vậy \(x = 6\).

b)

\(132 - 2\left( {x - 4} \right) = 46\)

\(\begin{array}{l}2\left( {x - 4} \right) = 132 - 46\\2\left( {x - 4} \right) = 86\end{array}\)

\(\begin{array}{l}x - 4 = 86:2\\x - 4 = 43\end{array}\)

\(\begin{array}{l}x = 43 + 4\\x = 47\end{array}\)

Vậy \(x = 47\).

c)

\(\begin{array}{l}{2^{x + 3}}{.2^2} = {2^2}.3 + 52\\{2^{x + 3}}.4 = 4.3 + 52\\{2^{x + 3}}.4 = 12 + 52\end{array}\)

\(\begin{array}{l}{2^{x + 3}}.4 = 64\\{2^{x + 3}} = 64:4\end{array}\)

\[\begin{array}{l}{2^{x + 3}} = 16 = {2^4}\\ \Rightarrow x + 3 = 4\\x = 4 - 3\\x = 1\end{array}\]

Vậy \(x = 1\).