$ \begin{aligned}解: 1.8+1.2x-1.8 &= 3.6-1.8 \\ 1.2x &= 1.8 \\ 1.2x÷1.2 &= 1.8÷1.2 \\ x &= 1.5 \\ \end{aligned}$ $ \begin{aligned} 解: 1.6x &= 96 \\ 1.6x÷1.6 &= 96÷1.6 \\ x &= 60 \\ \end{aligned}$ $ \begin{aligned} 解: 8x+4.2 &= 10.6 \\ 8x+4.2-4.2 &= 10.6-4.2 \\ 8x &= 6.4 \\ 8x÷8 &= 6.4÷8 \\ x &= 0.8 \\ \end{aligned}$ $ \begin{aligned}解: x÷120×120 &= 6×120 \\ x &= 720 \\ \end{aligned}$ $ \begin{aligned} 解: 2x-50 &= 200 \\ 2x-50+50 &= 200+50 \\ 2x &= 250 \\ 2x÷2 &= 250÷2 \\ x &= 125 \\ \end{aligned}$ $ \begin{aligned} 解: 16x÷30 &= 4 \\ 16x÷30×30 &= 4×30 \\ 16x &= 120 \\ 16x÷16 &= 120÷16 \\ x &= 7.5 \\ \end{aligned}$ $(48,64)=16，[48,64]=192 $ $ \begin{aligned}(2.2+4.8)×x÷2&=10.5 \\ 解：7x÷2&=10.5 \\ 3.5x&=10.5 \\ x&=3 \\ \end{aligned}$ $ \begin{aligned} 5x+3.2&=35.2 \\ 解：5x&=32 \\ x&=6.4 \\ \end{aligned}$
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