exam Maths Puzzle Numerical Ability

Please solve for r

2^(r+5) = 2^(2r-1)

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I wanted to know how you graph a linear system.
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There are 9 cows and 4 pins, I have to get the 9 cows in the 4 pins with out using the same number twice, also there can not be any preg. cows or any 1/2 cows?