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$\begin{aligned}解:x&=5.2-4.8\\x&=0.4\end{aligned}$
$\begin{aligned}解:x&=260+760\\x&=1020\end{aligned}$
$\begin{aligned}解:x&=2.73+7.27\\x&=10\end{aligned}$
$\begin{aligned}解:x&=32÷1.6\\x&=20\end{aligned}$
$\begin{aligned}解:x&=150×8\\x&=1200\end{aligned}$
$\begin{aligned}解:x&=36.9÷4.5\\x&=8.2\end{aligned}$
$\begin{aligned}解:x-12.4&=23.6\\x&=36\end{aligned}$
$\begin{aligned}解:3x&=120\\x&=40\end{aligned}$
90×2
2
x