exam Maths Puzzle Numerical Ability

Students in algebar class did an experiment similar to the information "WHERE THEY WOULD MEET" from lesson 6.1 they had two walkers start at opposite ends of the marked letgh and w

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Hello
with the substitution how do i solve:

2x - y = 3
6x - 9 = 3y

thank you Solve for x: 9^(2x-1)= (81^(x+1))(27^-x)