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$ \begin{aligned}解: 6x+6-6 &= 306-6 \\ 6x &= 300 \\ 6x÷6 &= 300÷6 \\ x &= 50 \\ \end{aligned}$

$ \begin{aligned} 解: 0.9x &= 1.08 \\ 0.9x÷0.9 &= 1.08÷0.9 \\ x &= 1.2 \\ \end{aligned}$

$ \begin{aligned} 解: 2x+1 &= 12 \\ 2x+1-1 &= 12-1 \\ 2x &= 11 \\ 2x÷2 &= 11÷2 \\ x &= 5.5 \\ \end{aligned}$

$ \begin{aligned} 解: 0.3x+3.6 &= 10.5 \\ 0.3x+3.6-3.6 &= 10.5-3.6 \\ 0.3x &= 6.9 \\ 0.3x÷0.3 &= 6.9÷0.3 \\ x &= 23 \\ \end{aligned}$

$ \begin{aligned}解: 4.8x÷0.5×0.5 &= 7.2×0.5 \\ 4.8x &= 3.6 \\ 4.8x÷4.8 &= 3.6÷4.8 \\ x &= 0.75 \\ \end{aligned}$

$ \begin{aligned}解: 0.25x+1.5 &= 4 \\ 0.25x+1.5-1.5 &= 4-1.5 \\ 0.25x &= 2.5 \\ 0.25x÷0.25 &= 2.5÷0.25 \\ x &= 10 \\ \end{aligned}$

18x=450 x=25

3x+450=

1050 x=200

$ \begin{aligned} 4×25+5x&=150 \\ 解：100+5x&=150 \\ 5x+100-100&=150-100 \\ 5x&=50 \\ 5x÷5&=50÷5 \\ x&=10 \\ \end{aligned}$

$ \begin{aligned} 4x+3x&=420 \\ 解：7x&=420 \\ 7x÷7&=420÷7 \\ x&=60 \\ \end{aligned}$