Question: Using the modern algebraic method of solving linear equations, solve: Sabrina has a certain amount of money initially, and Mario has 8 times what Sabrina

Using the modern algebraic method of solving linear equations, solve: "Sabrina has a certain amount of money initially, and Mario has 8 times what Sabrina has. When Sabrina and Mario add together the money they have, the total/sum amounts to 70$. How much money does Sabrina have initially? letting x be the amount of money Sabrina had initially."

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