1. Problem statement: You wrote 'solve all' but did not provide any specific problem to solve. 2. Formula used: For linear equations the formula is $ax+b=0 \Rightarrow x=-\frac{b}{a}$. For quadratic equations the formula is $ax^2+bx+c=0 \Rightarrow x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$. Important rules: Provide known variables and domain, show if you want full derivation or just the final answer. 3. Intermediate work: I cannot show intermediate algebra without a concrete problem. 4. How to proceed: Paste one problem and I will solve it step-by-step with formulas, simplification, and the final answer in LaTeX. 5. Final answer: Awaiting your specific problem to solve.