\(2^x+2^{x+1}+2^{x+2}=960-2^{x+3}\)
\(\Leftrightarrow 2^x+2^x.2+2^x.2^2.2^3=960\)
\(\Leftrightarrow 2^x(1+2+2^2+2^3)=960\)
\(\Leftrightarrow 2^x(1+2+4+8)=960\)
\(\Leftrightarrow 2^x.15=960
\)
\(\Leftrightarrow 2^x=64\)
\(\Leftrightarrow 2^x=2^6\)
Vậy: x = 6
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