`2^{x+5} - 3 . 2^{x} = 928`
$\Rightarrow$ `2^{x} . 2^{5} - 3 . 2^{x} = 928`
$\Rightarrow$ `2^{x} . (2^{5} - 3) = 928`
$\Rightarrow$ `2^{x} . 29 = 928`
$\Rightarrow$ `2^{x} = 928 : 29`
$\Rightarrow$ `2^{x} = 32`
$\Rightarrow$ `2^{x} = 2^{5}`
$\Rightarrow$ `x = 5`
$\text{Vậy}$ `x = 5`
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`x : [(1800 + 600) : 30] = 560 : (315 - 35)`
$\Rightarrow$ `x : [2400 : 30] = 560 : 280`
$\Rightarrow$ `x : 80 = 2`
$\Rightarrow$ `x = 2 . 80`
$\Rightarrow$ `x = 160`
$\text{Vậy}$ `x = 160`
