Exam Maths Puzzle Algebra

How do you solve this equation when trying to solve for x in terms of r?
x = 3x + 2r

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Exam Other Question

Attendance at a concert was 480. The ratio of adults to student was 5 to 3. How many adults attended? How many students attended? Solve each inequality. State the solution set using interval notation & graph it.
a^2 + a > 6

w - 6/w < 0

Find the vertex and intercepts for each quadratic function and sketch its