C1 - Linear equations $-$ Immediate

Examples :   $3x=5;2x-1=0$

C2 - Linear equations $-$ Like terms

Examples :   $5x=3x+2;-x+3=4x+5+2x$

C3 - Linear equations $-$ Like terms

Examples :   $2.3x+3.4=-2.6x-1;\frac{4x-5}{3}=\frac{-x-1}{6}$

C4 - Linear equations $-$ Expansion

Examples : $3x+2-3x=4x+x-5$     $2\left(2x+1\right)=3\left(-2x+5\right)$

C5 - Linear equations $-$ Expansion

Examples :   $5\left(1.3x+3.4\right)=4\left(-2.9x-5\right);3\left(\frac{x}{3}+2\right)=5\left(\frac{x}{6}-5\right)$

C6 - Linear equations $-$ Expansion

Examples : $\frac{5x}{3}+5=\frac{4x}{3}+5;\frac{2x+2}{3}=\frac{4x-5}{6}-\frac{3x+3}{2}$

C8 - Equations with 0, 1 or an infinity of solutions  

Examples : $2x=2-2x+4x;4\left(3x-5\right)=4\left(x-4\right)$

C10 - Fractional equations transforming into linear equations  

Example : $\frac{5}{-3x+1}=\frac{2}{4x+2};\frac{-3x-2}{-x-3}=2$