Solve the system of equations by substitution.
-4x 15y = -17
-x+ 5y = -13

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

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There are a total of 75 students in the robotics club and science club. the science club has 9 more students than the robotics club. how many students are in the science club?