exam Maths Puzzle Numerical Ability

10x/5 - 5 = 5x/5 + 1

Those are supposed to be fractions. Thank you for your help!

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exam Other Question

A plane flies 720 mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10 h, what is the planes speed in still air? How would you classify and graph the following system?

y=x+4
y+x=4

Then, how would you find the solution to this system from the graph?
Thank you!